Dirty MAF sensor
- Symptoms
- Lack of power, lean code, poor average
- Likely cause
- Dirt/oil on the hot wire (esp. oiled filters)
- Fix
- Clean with MAF cleaner; replace if out of spec
- Applies to
- All E120 (MAF on NZ and ZZ per RM821E)
- Related fault codes
- P0100, P0171
- Confidence
- medium
Sources
- toyotanation.com/threads/2003-2008-corolla-matrix-pontiac-vibe-common-
- toyotamanuals.gitlab.io/RM01J1E/htmlweb/rm01j1e/rm/rm821e/m_05_0025.pd
Related problems on this car
- Upstream O2 sensor ageing
- Ignition coil-on-plug failure / misfire
- Intake manifold gasket vacuum leak (1ZZ)
- Poor fuel average after a bad tune-up
Similar problems on other cars
- Check-engine light after cleaning the air-flow sensor · Toyota Vitz (1st gen)
- Lean code from an air leak (P0171) · Toyota Vitz (1st gen)
- Speed sensor fault (code P0500) · Suzuki Mehran (EFI, Euro II)
Where the parts are · Warning lights · Fault codes · Maintenance
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Guidance only – confirm with a mechanic before repairs. All common problems