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full bulletin at NHTSA ↗2008 Toyota Yaris engine problems
moderate 10 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
10
Recalls
0
Avg fix
$3,100
What stands out
Among the 5 model years of Toyota Yaris in our records for engine problems, this one ranks #2 by owner-complaint volume.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
TT: HVAC drain tube is found to be blocked/clogged.
full bulletin at NHTSA ↗TT: HVAC drain tube is found to be blocked/clogged.
full bulletin at NHTSA ↗TSB: REVISION NOTICE July 01, 2019 Rev2: ? Applicability has been updated to 2019 ? 2020 model year Toyota vehicles. ? The Techstream Preparation and Process Overview sections have been updated. October 30, 2017 Rev1: ? Applicability has been updated to include 2018 model year vehicles. Any previous printed versions of this bulletin should be discarded. SUPERSESSION NOTICE The information contained in this bulletin supersedes SB No. T-SB-0012-13. Service Bulletin No. T-SB-0012-13 is obsolete and any printed versions should be discarded. Be sure to review the entire content of this bulletin before proceeding. Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated
full bulletin at NHTSA ↗TSB: Supersession Notice. Flash reprogramming allows the ECU software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as field-fix procedures described in individual Service Bulletins. This bulletin details the Techstream ECU flash reprogramming process and outlines use of the Technical Information System (TIS) and the Calibration Update Wizard (CUW). Flash calibration updates can only be applied to the vehicle/ECU combination for which they are intended. ECUs have internal security that will not allow them to be programmed with another ECU?s information.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners report multiple engine and engine-management system failures in 2008 Yaris vehicles.
Wiring harness issues stand out as the most recurring complaint. Several owners reported the engine wiring harness failing, causing stalling at highway speeds, loss of power, and inability to accelerate—problems that occurred both while driving and while stationary. Dealers identified the mass O2 sensor wiring harness and the main engine harness as defective; Toyota issued a TSB for an "improved" harness, but these repairs are not recalled and can cost $1,000 out-of-pocket.
Engine noise and wear appear in multiple reports. Owners describe rattling or abnormal noises from the engine starting at 20,000 miles and persisting to higher mileage; mechanics have suggested worn timing chains, rod knock, or camshaft sprocket wear. At 160,000 miles, one owner had worn chain sprockets diagnosed on both camshafts.
Head gasket leaks were confirmed by dealership dye testing; one owner discovered oil seeping from the #1 cylinder head gasket and noted seeing the same leak pattern on other Yaris models of similar vintage.
AC system drainage is cited as a design flaw that allows water to accumulate in the passenger floor rather than drain properly.
One owner also reports a failed charcoal canister (evaporative emissions control) costing $996 to replace.
Same Toyota Yaris engine reports on nearby years: 2007
Failure modes owners describe
Engine wiring harness failure
The engine wiring harness (including mass O2 sensor harness) develops electrical faults that cause the engine to stall or lose power, particularly during acceleration or highway driving.
When: 45,000 to 55,383 miles
Symptoms owners cite: Stalling while driving at highway speeds (55 mph); Stalling at any speed or while stopped; Loss of power and inability to accelerate; Check engine light illumination
Codes mentioned: Check engine light
Repairs/costs cited: Toyota dealership replacement of engine harness or mass O2 sensor harness; cost cited as $1,000 when out-of-warranty
Recalls/TSBs owners mention: TSB issued for replacement with 'improved' harness; not recalled; not covered under powertrain warranty on drive-by-wire vehicles
Head gasket leaks
Oil leaks from the head gasket, confirmed by dealership dye testing. Owner reports observing the same leak pattern on multiple other Yaris models, particularly from the #1 cylinder.
When: Observed during routine maintenance; no specific mileage given for 2008 unit
Symptoms owners cite: Oil leaking from back of engine to oil pan; Oil visible from #1 cylinder head gasket area
Repairs/costs cited: Head gasket replaced by dealer; no cost provided
Engine noise and internal wear
Abnormal rattling or noise from the engine, variously attributed to timing chain wear, camshaft sprocket wear, or rod knock. Occurs at startup and while driving.
When: 20,000 miles (abnormal noise at startup); 160,000 miles (worn camshaft sprockets diagnosed)
Symptoms owners cite: Rattling noise from engine while driving; Rattling noise while parked; Abnormal engine noise at startup
Repairs/costs cited: Dealers suggested water pump replacement, engine belt replacement, or engine replacement; camshaft sprocket wear confirmed in one instance but not repaired; no costs provided for most cases
Recalls/TSBs owners mention: Manufacturer stated no recall available for worn camshaft sprockets
AC condensate drainage blockage
Water does not drain properly from the AC condenser due to a design flaw, causing water to accumulate on the passenger-side floor instead of draining outside.
When: Not specified
Symptoms owners cite: Water accumulating in passenger-side floor; AC condensate not draining properly
Repairs/costs cited: Dealership service attempt made but problem persisted
Charcoal canister failure
The charcoal canister assembly, part of the evaporative emission control system, failed and required replacement.
When: Not specified
Repairs/costs cited: Charcoal canister assembly replaced; cost $996
Synthesized from 10 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 0 most recent
Had engine trouble with your 2008 Toyota Yaris?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2008 Toyota Yaris?
It's a documented issue but not catastrophic. 10 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 10 complaints that reported odometer mileage, most engine failures cluster between 17,893 and 64,200 miles, with the median around 55,383. A quarter of owners report trouble before 17,893; a quarter make it past 64,200. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2008/Toyota/Yaris.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.