OBD-II code · Powertrain (generic, extended)
P2179 System Too Lean Off Idle Bank 2
Fuel trims on bank 2 show a lean deviation during off-idle operating conditions. Causes are similar to bank 1 but isolated to the second cylinder bank.
Is it safe to drive with P2179?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyVacuum leak on bank 2
- PossibleLow fuel pressure
Symptoms
- Check engine light on
- Rough idle, possible stalling
- Hesitation or hard cold start
- Power loss under load
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Intake Manifold, Vacuum Hoses, Fuel Injector, Mass Air Flow Sensor
Related codes
- P2177System Too Lean Off Idle Bank 1
- P2176Throttle Actuator A Control System - Idle Position Not Learned
- P2178System Too Rich Off Idle Bank 1
- P217AFuel Injector Group G Supply Voltage Circuit/Open
- P217BFuel Injector Group G Supply Voltage Circuit Low
- P217CFuel Injector Group G Supply Voltage Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.