KNOWN FAULTS · Toyota

Toyota Yaris (IV) 1.5 Hybrid common problems.

2020–2026 · Hybrid

Sources are not verified in real time and no entry confirms that your car is affected.

5 known faults with sources

Applies if: The Toyota USA bulletin does not list this model, but its hybrid battery is also cooled with cabin air through a filter.

Clogged hybrid battery cooling fan and filterHigh-voltage battery

Engine / equipment: Hybrid battery cooled with cabin air (intake next to the rear seat): Prius, Yaris, Auris, Corolla, C-HR, RAV4, Camry and others
Period mentioned: 2003 onwards
Symptoms: Hybrid battery cooling maintenance message, warning light with codes P0A80 or P0A7F, a noisy fan and less electric assistance; if ignored, the battery ages faster.
Possible cause described: Dust, pet hair or dirt block the filter and fan that cool the battery; so do objects covering the intake. Toyota USA issued bulletin T-SB-0074-20 (2003–2020 Prius and Camry, Corolla, Highlander, RAV4 and Mirai hybrids up to 2020) and recommends cleaning the filter every 5,000 miles (about 8,000 km).
Check for the garage: Clean or replace the filter and clean the fan before condemning the battery; keep the intake grille clear. At the garage, read the codes and, if needed, install the software Toyota specifies.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Applies if: Weak points of this model from inspections, breakdown statistics and recalls; anything specific to one engine is stated in the sheet.

Recalls on the Yaris IVElectrical and electronic systems

Engine / equipment: Toyota Yaris IV (petrol, hybrid and GR Yaris)
Period mentioned: 2020 onwards
Symptoms: Headlamps that will not switch between dipped and main beam, ABS, PreCrash or parking brake switching off, an eCall that does not work and failing driver aids.
Possible cause described: No typical faults are known yet, but there are recalls (KBA): the headlamp mechanism, the rear centre seat-belt guide, brake-actuator software, eCall and radar-sensor initialisation.
Check for the garage: Check every campaign by VIN.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Applies if: Built before February 2024 (since then they have a higher-capacity 12 V battery).

Will not start because of a flat 12 V battery on the Yaris and Yaris Cross hybridsElectrical and electronic systems

Engine / equipment: 1.5 hybrid: fourth-generation Toyota Yaris and Yaris Cross
Period mentioned: 2020–2024
Symptoms: After a few days parked, the car will not start (it does not go to “Ready”) because the auxiliary 12 V battery is very low or flat. It mainly affects people who drive few kilometres.
Possible cause described: According to an internal 2024 Toyota technical note reported by L'argus (March 2025), the original 12 V battery was too small to recharge quickly enough while driving. Since February 2024, Yaris and Yaris Cross built in France and the Czech Republic have an LN0 12 V 35 Ah battery with twice the charge capacity.
Check for the garage: Measure and test the 12 V battery. If the car was built before February 2024, ask Toyota to replace it with the new higher-capacity battery (the part number depends on whether the battery was fitted before or after October 2024). In the meantime, make somewhat longer trips or use a battery maintainer if the car stays parked for days.
Cost cited in the source: Toyota replaces it under the 3-year or 100,000 km warranty.A rough figure from the original database, not an up-to-date quote.

Toyota Yaris (IV) 1.5 Hybrid: known faults of the engine according to L'argusEngine

Engine / equipment: 1.5 Hybrid in the Toyota Yaris (IV)
Period mentioned: 2020–2026
Symptoms: Will not start because the 12 V battery is flat (up to January 2024)
Possible cause described: According to the brand's technical notes reported by L'argus (each date shows up to when the affected cars were built): 1) Will not start because the 12 V battery is flat (up to January 2024): Battery to be replaced with a new part number.
Check for the garage: Compare your symptom and your car's build date with this list. If they match, tell the workshop and ask them to check that part first before replacing others. The brand or a warranty extension covers some repairs: ask the dealer with the car's details.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Toyota Yaris (IV): known faults of the electronics and interior according to L'argusElectrical and electronic systems

Engine / equipment: Toyota Yaris (IV), all engines
Period mentioned: 2020–2026
Symptoms: Various Toyota Touch 3 multimedia faults (up to December 2024); Damp patches on the headlining, the windscreen is hard to demist and warning lights come on
Possible cause described: According to the brand's technical notes reported by L'argus (each date shows up to when the affected cars were built): 1) Various Toyota Touch 3 multimedia faults (up to December 2024): Update. 2) Damp patches on the headlining, the windscreen is hard to demist and warning lights come on: Repair or replace the headlining.
Check for the garage: Compare your symptom and your car's build date with this list. If they match, tell the workshop and ask them to check that part first before replacing others. The brand or a warranty extension covers some repairs: ask the dealer with the car's details.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.