KNOWN FAULTS · Toyota

Known faults for the Toyota Corolla (XII).

2019–2026 · Petrol / Hybrid

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

3 known faults with sources

Engines: 1.2 T (Petrol)

Ignition coils and carbon on the 1.2 turbo (8NR-FTS)Engine

Engine / equipment: 1.2 turbo petrol (8NR-FTS): Auris, C-HR and Corolla
Period mentioned: 2015–2022
Symptoms: Poor acceleration and strong jerking, misfires and limp mode; at high mileage, loss of power and higher consumption from carbon on injectors, valves and intake.
Possible cause described: The coils fitted up to mid-2018 have a suspected manufacturing defect; Toyota usually replaces them as goodwill. Direct injection encourages carbon build-up.
Check for the garage: Read misfire codes and check the coil date; ask for a goodwill replacement; clean the intake if there are deposits.
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.

Engines: 1.2 T (Petrol) · 1.8 / 2.0 Hybrid (Hybrid)

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

Battery, rear brakes, brake servo and eCall on the Corolla (from 2019)Known weak points

Engine / equipment: Toyota Corolla (2019 onwards: 1.2 turbo and hybrids)
Period mentioned: 2019 onwards
Symptoms: A starter battery that fails early on the first cars; seized and rusty rear brakes, especially on hybrids; a brake servo that can fail on 2019 cars (more pedal effort); an eCall that does not activate.
Possible cause described: The brake-servo pump is replaced under warranty or goodwill. A recall for the eCall on cars built 2018 to 2021.
Check for the garage: Check the campaigns by VIN; brake hard now and then to clean the rear discs; test the battery.
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.

Engines: 1.8 / 2.0 Hybrid (Hybrid)

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.