Powertrain
generic / SAE
P2177
System Too Lean Off Idle Bank 1
Fuel trim values on bank 1 indicate a lean condition during off-idle operation. The ECU has to add significant fuel correction to maintain stoichiometric mixture above idle.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number1 / 77
Possible causes
- Vacuum leak under load high
- Low fuel pressure / weak pump medium
- Contaminated MAF sensor medium
Symptoms
- Check engine light on
- Rough idle, possible stalling
- Hesitation or hard cold start
- Power loss under load
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–600 €
- Estimated time: 0.5–3 h
- Component: intake manifold
- Component: vacuum hoses
- Component: mass air flow sensor
- Component: fuel pump
- Component: fuel injector
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012