VinSpectorAI Logo
HomeHow It Works Pricing Vehicle StatsBlog Garage VIN Search Inspection Guide
LoginDemo
  1. Vehicle Stats
  2. Volkswagen
  3. Passat Reliability
⚑ NHTSA Official DataUpdated: May 2026Methodology

Volkswagen Passat Reliability by Year
Best & Worst Years, Problems & Recalls β€” NHTSA Data

Comparing used Volkswagen Passat options? We analyzed 10 model years (2013–2022) using real NHTSA complaint and recall data so you can spot stronger years, avoid riskier ones, and know what to inspect before buying.

πŸ“‹
1,872
Total Complaints
NHTSA filed
πŸ””
47
Safety Recalls
federal campaigns
πŸ’₯
76
Crash-Related
crash complaints
πŸ”₯
10
Fire-Related
fire complaints
πŸ₯
61
Injuries Reported
across all years
πŸ“ˆ
Below Average
Reliability Signal
overall trend

Model-year trends show patterns. Run a VIN check for the exact Volkswagen Passat you plan to buy.

Quick Answer

VOLKSWAGEN PASSAT from 2013-2022 has 1872 NHTSA complaints and 47 recalls. Air bags lead with 882 complaints, followed by engine (275) and electrical system (268). The 2013 model year is the worst with 747 complaints. Source: NHTSA owner complaints and recall records.

Volkswagen Passat β€” key reliability facts
Make
Volkswagen
Model
Passat
Model years analyzed
2013–2022 (10 years)
Total NHTSA complaints
1,872
Safety recall campaigns
47
Crash-related complaints
76
Fire-related complaints
10
Worst model year (by complaints)
2013 (747 complaints)
Best model year (fewest complaints)
2022 (9 complaints)
Top reported issue area
AIR BAGS
Reliability signal
Below Average
Source: NHTSA (National Highway Traffic Safety Administration) Β· Data last refreshed May 24, 2026
This Passat has 47 open recall campaigns on record. Check whether yours is affected.Check my VIN free β†’

Volkswagen Passat: Which Years to Avoid & Which to Buy

Based on total NHTSA owner complaints per model year. Higher complaint counts indicate a riskier year to buy used β€” lower counts suggest a cleaner reliability record.

⚠ Years to Avoid
2013 Volkswagen Passat747 complaints2014 Volkswagen Passat590 complaints2015 Volkswagen Passat242 complaints

These years have the most owner complaints. Inspect carefully and always run a VIN check.

βœ“ Best Years to Buy
2022 Volkswagen Passat9 complaints2019 Volkswagen Passat12 complaints2020 Volkswagen Passat15 complaints

These years have the fewest owner complaints on record β€” lower risk starting points.

⭐ NHTSA NCAP Crash Test Ratings

New Car Assessment Program

NCAP crash tests measure how well a vehicle protects occupants in controlled frontal crash, side crash, and rollover scenarios. Stars are awarded per category (5 = safest). These laboratory results are independent of owner complaints and are performed by NHTSA engineers on new production vehicles.

2022
2022 Volkswagen Passat 4 DR FWD
Overall Safety
β˜…β˜…β˜…β˜…β˜…4/5
Frontal Crash
β˜…β˜…β˜…β˜…β˜…3/5
Side Crash
β˜…β˜…β˜…β˜…β˜…5/5
Rollover Risk
β˜…β˜…β˜…β˜…β˜…4/5
2021
2021 Volkswagen Passat 4 DR FWD Later Release
Overall Safety
β˜…β˜…β˜…β˜…β˜…4/5
Frontal Crash
β˜…β˜…β˜…β˜…β˜…3/5
Side Crash
β˜…β˜…β˜…β˜…β˜…5/5
Rollover Risk
β˜…β˜…β˜…β˜…β˜…4/5
2020
2020 Volkswagen Passat 4 DR FWD
Overall Safety
β˜…β˜…β˜…β˜…β˜…5/5
Frontal Crash
β˜…β˜…β˜…β˜…β˜…4/5
Side Crash
β˜…β˜…β˜…β˜…β˜…5/5
Rollover Risk
β˜…β˜…β˜…β˜…β˜…4/5
How to Read NCAP Stars
β˜…β˜…β˜…β˜…β˜…5 stars - Excellent
β˜…β˜…β˜…β˜…4 stars - Good
β˜…β˜…β˜…3 stars - Average
β˜…β˜…2 stars - Below average
β˜…1 star - Poor
Source: nhtsa.gov/ratings

What the Complaint Data Suggests

Below Average
Editorial interpretation of NHTSA public complaint data. Source: nhtsa.gov. Complaints are owner-submitted and do not confirm a defect. Methodology

Based on NHTSA complaint data, the 2013-2022 Volkswagen Passat has 1872 total complaints and 47 recalls. The most reported component is air bags with 882 complaints, followed by engine (275) and electrical system (268). Crash-related complaints number 76. Source: NHTSA owner complaints and recall records.

Key Findings
  • Air bags account for 882 complaints, the highest of any component.
  • The 2013 model year has 747 complaints, the most of any year.
  • Engine complaints total 275, the second most reported component.
Top Concerns
  • Air bags
  • Engine
  • Electrical system
⚠️ Worst Years

The 2013 model year has the most complaints (747), driven largely by air bag and engine issues.

βœ… Best Years

The 2021 and 2022 model years have the fewest complaints (0 and 9 respectively), suggesting improved reliability.

What to Check Before Buying Used
  • Verify all open recalls at nhtsa.gov/recalls.
  • Request service records for air bag, engine, and electrical system repairs.
  • Have a mechanic inspect the vehicle before purchase.
  • Check for any outstanding safety recalls related to air bags.
Data note: NHTSA complaints are consumer-submitted and do not confirm a manufacturing defect. Complaint counts may be influenced by reporting bias or vehicle popularity.

πŸ“… Problems by Model Year (Best vs. Worst Years)

2013
747
2014
590
2015
242
2016
106
2017
107
2018
44
2019
12
2020
15
2022
9
Source: NHTSA public complaints database. Updated: May 2026

πŸ”” NHTSA Safety Recalls

47 recalls found

Safety recalls are mandatory repair campaigns ordered by NHTSA when a vehicle defect poses an unreasonable risk to safety. Manufacturers are required to fix recalled vehicles free of charge. Always verify open recalls before buying a used car.

Campaign #21V321000May 5, 2021

Safety Recall

Component: UNKNOWN OR OTHER
Campaign #21V321000May 5, 2021

Safety Recall

Component: UNKNOWN OR OTHER
Campaign #20V533000February 9, 2020

Safety Recall

Component: AIR BAGS:PASSENGER SIDE FRONTAL:CUSHION
Campaign #18V369000January 6, 2018

Safety Recall

Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:CALIPER
Campaign #17V075000August 2, 2017

Safety Recall

Component: SERVICE BRAKES, HYDRAULIC:FLUID
Campaign #16V403000June 6, 2016

Safety Recall

Component: FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:FUEL RAIL
Campaign #21V812000

Safety Recall

Component: WHEELS:LUGS/NUTS/BOLTS/STUDS
Campaign #19V389000

Safety Recall

Component: EXTERIOR LIGHTING:HEADLIGHTS
Campaign #19V218000

Safety Recall

Component: AIR BAGS:SIDE/WINDOW
Campaign #19V389000

Safety Recall

Component: EXTERIOR LIGHTING:HEADLIGHTS
Campaign #18V536000

Safety Recall

Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:CALIPER
Campaign #19V389000

Safety Recall

Component: EXTERIOR LIGHTING:HEADLIGHTS
Campaign #20V561000

Safety Recall

Component: UNKNOWN OR OTHER
Campaign #19V389000

Safety Recall

Component: EXTERIOR LIGHTING:HEADLIGHTS
Campaign #15V705000

Safety Recall

Component: ENGINE AND ENGINE COOLING:ENGINE
Campaign #20V561000

Safety Recall

Component: UNKNOWN OR OTHER
Campaign #20V561000

Safety Recall

Component: UNKNOWN OR OTHER
Campaign #18V536000

Safety Recall

Component: SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:CALIPER
Campaign #19V679000

Safety Recall

Component: UNKNOWN OR OTHER
Campaign #19V389000

Safety Recall

Component: EXTERIOR LIGHTING:HEADLIGHTS

Source: NHTSA Recalls Database. Data covers model years 2013–2022. Always run a VIN-specific check below for the most up-to-date open recall status.

πŸ”§ Most-Reported Problem Areas

Based on component keywords extracted from all 1,872 NHTSA complaints.

1
AIR BAGS
882 complaints
2
ENGINE
275 complaints
3
ELECTRICAL SYSTEM
268 complaints
4
UNKNOWN OR OTHER
218 complaints
5
STEERING
161 complaints
6
FUEL/PROPULSION SYSTEM
160 complaints
7
POWER TRAIN
99 complaints
8
SERVICE BRAKES
98 complaints

πŸ“‹ NHTSA Complaint Reports

1,872 total

These are consumer-submitted safety complaints filed directly with NHTSA. Each complaint describes a real owner's experience. Complaints flagged as crash-related or fire-related are highlighted.

UNKNOWN OR OTHER,ENGINEMar 2026

2020 Volkswagen Passat SE 2.0L VIN: [XXX] Complaint Summary: I am reporting a persistent and unresolved fault involving the secondary air injection system (DTC P0491 – insufficient airflow) that has resulted in repeated, conflicting diagnoses across multiple repair facilities. This raises concerns about a potential systemic defect affecting this vehicle model. Detailed Description: The issue began prior to March 2025 while the vehicle was still under warranty. The vehicle displayed a Check Engine Light associated with diagnostic trouble code P0491 (secondary air injection system insufficient airflow). On April 3, 2025, a repair facility diagnosed the issue as a failed secondary air injection pump and replaced the component. However, the Check Engine Light returned within 24 hours with the exact same fault code, indicating that the repair did not resolve the issue. A second independent diagnostic evaluation was performed later in April 2025. This inspection confirmed that: The secondary air injection pump was functioning correctly Airflow through the system was present Electrical controls and PCM commands were operating properly The fault was attributed instead to a mechanically stuck secondary air injection combination valve Despite this revised diagnosis, the issue has remained unresolved. As of 2026, a dealership evaluation has now attributed the same fault condition to a potential failure within the cylinder head assembly, indicating a significantly more serious underlying condition. Safety Concern: This issue involves the emissions and engine air management system and has resulted in: Persistent Check Engine Light Repeated failure of emissions-related components Conflicting and escalating repair diagnoses across multiple qualified service providers I am requesting that the National Highway Traffic Safety Administration review this issue for potential investigation into a systemic defect. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

STEERING,AIR BAGS,FORWARD COLLISION AVOIDANCEDec 2025

Steering wheel controls stopped working, no horn either. Probably no airbag but haven't got into an accident. There was recall on the same part for the until 2018, but the new part I was going to install lists that if fits cars 2016-2022 Part # 5K0-953-569-BC Recall from VW. Number: VWP-18-11, Will replace part for my fiance,

AIR BAGS,FORWARD COLLISION AVOIDANCEMar 2025

Error message alerted to maintenance needed and the air bag light has turned on and remained on. Also said message that front assist inls unavailable.

ENGINEOct 2024

Oil pressure sensor fails. Causing high oil pressure. Causing the valve cover to be destroyed and the oil pan to leak. Draining the car oil.

UNKNOWN OR OTHERApr 2024

VIN: [XXX] Dealership: Vanguard Volkswagen 6900 Burnet Rd Austin, TX 78757 I bought 2020 Passat back in Aug 2020 with CarNet included. It was showing that CarNet will be installed later when available at no cost. So in 2021 they installed carnet and everything was working fine up until 2024. The light turned off and no connection to the car. I called CarNet and they told me that most likely an issue with HW module and suggested to take to the dealer to get reset/replaced. Went to the dealer few days ago. Left them a car for 3 days for diag. No fault codes. So dealer sent a ticket to the Volkswagen to see how to proceed. I got a call from dealership today that Volkswagen responded to them that 2020 Passat is no longer eligible for the CarNet. Excuse me? At the time of sale CarNet was included. It was working fine no issues. And now Volkswagen taking car feature away that it came with and I paid for.. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

ENGINEApr 2024

Bought car from dealer. Vw Manhattan. 42000miles. 8 months later at 53000 miles. Engine problems. Went to Vw service. Head gasket. Lemon car. Warranty till 50000 miles. Cost? 4800$ Worse car possible.

UNKNOWN OR OTHERMar 2024

Our vehicle will not speed up after accelerating but you can hear the engine making noise like it’s trying to speed up. We have taken our vehicle 3-4 times back to the dealership and they have told us they found nothing.

FUEL/PROPULSION SYSTEMFeb 2024

Car wasn’t pulling up the road the epc light came on had to have my vehicle rolled to the next dealer which was 36 miles from where I was. I was traveling from grapevine tx and it start acting up in Huntsville tx. Came out of pocket 1085.00 and that was with a discount for the fuel injector #3 My warranty expired 3000 miles ago. I am the first owner on my vehicle.

STEERING,ELECTRICAL SYSTEM,AIR BAGSAug 2023

My clock spring isn’t working after having my vehicle for barely a year. My air bag light is currently on. I can’t use my horn nor use any of the controls on my steering wheel. I’ve paid already 800 plus on previous car issues such as my harness hose. I’m still awaiting reimbursement. Further review and assistance needed.

ENGINE AND ENGINE COOLINGJun 2023

The contact owns a 2020 Volkswagen Passat. The contact stated while driving at various speeds, the vehicle made abnormal sounds. The contact stated that the vehicle started independently, and the Driver Assist function engaged independently. Additionally, the contact stated that the vehicle was swerving unintendedly and would vibrate while driving. The vehicle was taken to the dealer several times; however, the dealer informed the contact that they could not duplicate the failure. The dealer later replaced the brake rotors; however, the failure persisted. The electronic power control (EPC), the Adaptive Cruise Control and low oil pressure warning lights were illuminated. Additionally, the message "Front Assist Error" was displayed. The vehicle was taken to the dealer, where it was diagnosed that the brake caliper was fractured. The vehicle was not repaired. The contact stated that the dealer had previously replaced the thermostat as the message "Coolant Error" was displayed on the instrument panel. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 7,000.

πŸ’₯ CrashπŸ₯ 1 InjuryAIR BAGS,SEAT BELTSMay 2023

HELLO MY DOUGHTER HAD A ACCIDENT CAR WAS TOTAL LOSS AND AIR BAGS DID NOT POP UP AND SEAT BELT WAS NOT TIGHT ENOUGH

FORWARD COLLISION AVOIDANCESep 2022

The Volkswagen Front Assist (sometimes referred to as Forward Collision Warning) system employed without having anything/anyone in front of the vehicle - no traffic in front, behind or on the side and the brakes engaged the brought the car to a complete stop in the street. This has been reported to Volkswagen and we have been told that their engineers are working on this issue but the vehicle is safe to drive. The day was a clear day. Date is approximate - I don't have my phone on me with the photo.

SERVICE BRAKESMar 2021

THE BREAKS IS VERY WEAK I WAS GOING TO HIT THE CAR AT THE FRONT OF ME WITH 1 INCH ! IT TOOK THE CAR LIKE 4 SECONDS TO STOP NOT SURE WAS IT JUST THE BREAKS OR THE BREAKS AND TIRES , THE CAR KEPT MOVING AFTER PRESSING THE BREAKS HARD ENOUGH , I WAS SHAKING SINCE I JUST GOT THE CAR 4 DAYS AGO !

WHEELSSep 2020

I WAS DRIVING DOWN THE HIGHWAY SOUTH SHORE IN RANDOLPH MA STOUGHTON EXITS AND I HEARD A POP IN MY DRIVER SIDE REAR TIRE AND WHEN I PULLED OVER I CHECKED MY TIRE AND MY TIRE WAS COMPLETELY FLAT AND THERE WAS A HOLE APPROXIMATELY THE SIZE OF A HAND GUN BULLET HOLE IN MY RIM. I WAS GOING A LITTLE UNDER THE SPEED LIMIT DUE TO HAVING A 3 YEAR OLD IN THE VEHICLE IN THE FAR RIGHT SLOW LANE. THE FOLLOWING MORNING I WENT TO GET THE TIRE INSPECTED IT WAS CONFIRMED THERE WAS A HUGE PIECE OF GLASS IN MY TIRE.

UNKNOWN OR OTHER,ENGINESep 2020

PARK ASSIST NOT AVAILBLE. LOSS OF ENGINE POWER ON LEFT OR RIGHT TURN

SERVICE BRAKESMar 2025

Brake issues that consist of brakes not engaging immediately as I press the brake pedal. Brake pedal also doesn't return as fast as my foot lets off of it. It could be inspected upon request. If the brakes dont engage immediately then there is a potential for an accident if I need to brake at a moments notice. Yes the problem has been confirmed. No it hasn't been inspected. No there isn't a warning.

FUEL SYSTEM, GASOLINEOct 2022

The contact owns a 2019 Volkswagen Passat. The contact stated that while driving at an undisclosed speed, the vehicle was shaking and then lost motive power. The contact pushed the vehicle to an independent mechanic who diagnosed that the fuel injector needed to be replaced. The mechanic replaced the fuel injector. The manufacturer was made aware of the failure and informed the contact that there was no recall associated with the VIN. The failure mileage was approximatelyΒ 40,000.

ELECTRICAL SYSTEM,SERVICE BRAKES,FORWARD COLLISION AVOIDANCESep 2020

TL* THE CONTACT OWNS A 2019 VOLKSWAGEN PASSAT. THE CONTACT STATED THAT WHILE DRIVING AT VARIOUS SPEEDS, THE COLLISION AVOIDANCE SYSTEM INDEPENDENTLY ACTIVATED CAUSING THE VEHICLE TO ABRUPTLY STOP EVEN THOUGH THERE WERE NO VEHICLES OR OBJECTS NEARBY. THE VEHICLE WAS TAKEN TO THE LOCAL DEALER FAIRFIELD VW LOCATED AT 5071 LYCOMING MALL DR, MONTOURSVILLE, PA 17754 HOWEVER, THE CAUSE OF THE FAILURE WAS NOT DETERMINED. ADDITIONALLY, ON SEVERAL OCCASIONS THE VEHICLE WOULD NOT START WHEN PUSHING THE START/STOP BUTTON AND THE MESSAGE "NO KEY DETECTED" WAS SOMETIMES DISPLAYED. THE CAUSE OF THE FAILURE WAS NOT DETERMINED. THE FAILURE MILEAGE WAS 15,000.

ENGINE,FUEL/PROPULSION SYSTEMFeb 2020

TL* THE CONTACT OWNS A 2019 VOLKSWAGEN PASSAT. THE CONTACT STATED WHILE DRIVING AT VARIOUS SPEEDS, THE VEHICLE IDLED WITH THE EPC LIGHT AND THE CHECK ENGINE WARNING LIGHT ILLUMINATED. ADDITIONALLY, THE VEHICLE WAS BELABORED WHILE SHIFTING GEARS AND AT LOW SPEEDS. THERE WAS AN ABNORMAL SOUND COMING FROM THE ENGINE. THE VEHICLE WAS TAKEN TO THE DEALER (HERITAGE VOLKSWAGEN CATONSVILLE 6624 BALTIMORE NATIONAL PIKE, BALTIMORE, MD 21228) FOR DIAGNOSIS AND REPAIRS. THE CONTACT WAS INFORMED THAT THE FUEL PUMP MODULE AND FUEL INJECTORS NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED HOWEVER, THE FAILURE RECURRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE BUT OFFERED NO ASSISTANCE OR RESOLUTION. THE APPROXIMATE FAILURE MILEAGE WAS 6,000. *TP

ELECTRICAL SYSTEM,UNKNOWN OR OTHER,ENGINEDec 2019

VEHICLE WAS SOLD WITH REMOTE START FEATURE. DEALER AND SALESMAN KNEW THE REMOTE START DID NOT WORK. THIS WAS A SELLING POINT ON THE CAR. THEY KEEP PUTTING OFF FIXING THE ISSUE WITH THE CAR.

Showing 20 of 1,872 total NHTSA complaints. Source: NHTSA Complaints Database

Before You Buy, Check the Exact Volkswagen Passat

These pages show model-year patterns across 10years. Enter a VIN to verify the exact vehicle's accident history, title brands, odometer records, and open recall status before purchase.

πŸ“– Understanding This Data

πŸ“‹

What is an NHTSA Complaint?

An NHTSA safety complaint is a report filed directly by a vehicle owner or driver describing a safety-related issue. Anyone can submit a complaint at NHTSA.gov. The number of complaints is a signal of how common a problem is β€” but complaints per model-year matter more than raw totals, since popular vehicles naturally receive more reports. The Volkswagen Passat has 1,872 complaints on record across 10 model years.

πŸ””

What is a Safety Recall?

A safety recall is a mandatory campaign issued by NHTSA when a vehicle component poses an unreasonable risk to safety or does not comply with federal motor vehicle safety standards. Unlike complaints (which are owner-reported), recalls are formally investigated and confirmed by regulators. Manufacturers must fix recalled vehicles free of charge. The Volkswagen Passat has 47 recall campaigns in the NHTSA database.

πŸ’₯

What Are Crash Complaints?

Crash complaints are NHTSA filings where the owner indicates a crash occurred as part of the incident. 76 of the Volkswagen Passat's 1,872 complaints involved a crash. This metric is particularly important because it indicates how often defects resulted in actual collisions β€” a key safety signal beyond general reliability.

🧭

How Is the Reliability Verdict Calculated?

The reliability verdict (Below Average) is generated by analyzing the vehicle's total complaints, recall history, crash complaint ratio, fire complaint ratio, and top component failures relative to class averages. This verdict gives buyers a quick interpretation before they review year-level details and VIN-level history. It should be treated as one decision input, not a substitute for a VIN-specific report.

πŸ“Š

Why Do Newer Years Have Fewer Complaints?

Newer model years appear to have fewer complaints because there has been less time for owners to file them. Complaints accumulate over years of ownership. A 2020 model year vehicle will typically show fewer complaints than a 2015 model year even if it is less reliable β€” simply because fewer owners have had time to report issues. Focus on complaints per year of market presence when comparing across model years.

πŸ”

Fleet Data vs. Individual VIN

Everything on this page reflects aggregated data across all Volkswagen Passat vehicles on the road β€” not any specific car. Two Volkswagen Passat vehicles of the same year can have very different histories: one may have been in three accidents and have an open recall; another may be clean. A VIN check gives you the individual car's history: accidents, title brands, odometer records, service history, and real-time recall status.

πŸ”Ž

What Are NHTSA Investigations?

When NHTSA receives a pattern of related safety complaints, it opens a formal investigation. A Preliminary Evaluation (PE) is the first stage β€” NHTSA determines if a safety defect may exist. If evidence is strong, it escalates to an Engineering Analysis (EA), which can result in a mandatory recall. The Volkswagen Passat has 0 investigations on record (0 active). Investigations listed above may have already led to the recalls shown on this page.

Buyers Also Compare

How does the Volkswagen Passat stack up? Compare complaint history with similar vehicles.

Toyota Camry reliability β†’Ford F 150 reliability β†’Chevrolet Silverado reliability β†’
Volkswagen Passat vs Toyota CamryVolkswagen Passat vs Ford F 150Volkswagen Passat vs Chevrolet Silverado

Other Volkswagen Models

Compare vs Honda Accord β†’
Volkswagen JettaVolkswagen TiguanVolkswagen AtlasVolkswagen GolfAll Volkswagen Models β†’

VinSpectorAI

The world's most advanced AI-powered vehicle history platform. Comprehensive insights, fraud detection, and smart analysis for any vehicle.

5M+
Reports
50+
Brands
AI
Powered
Check Any VIN Free
Product
  • VIN Search
  • VIN Search by State
  • AI Analysis
  • Pricing
Company
  • About Us
  • Contact
  • Blog
  • Affiliate Program
Support
  • FAQ
Legal
  • Terms of Service
  • Privacy Policy

Β© 2026 VinSpectorAI. All rights reserved.

contact@vinspectorai.com
Made with for car enthusiasts