The mixture is lean once the engine is off idle. Distinct from P0171 because it points at conditions under airflow rather than at idle vacuum.
P2177 — also written P2177, P 2177, 2177 — is the OBD-II code for system too lean off idle (bank 1). Same code, same fix: this page covers every spelling of it.
P2177 is a fuel & air fault code, typically costing £80–£700 to put right in a UK garage.
What causes P2177?
- Weak fuel pump or blocked filter
- Failing MAF under-reading at higher flow
- Boost or intake leak that opens under pressure
- Injector flow restriction
How P2177 is fixed
- Test fuel pressure under load, not just at idle
- Smoke-test intake and boost pipework
- Clean or replace the MAF
- Injector flow test
P2177 repair cost in the UK
Most P2177 repairs land between £80–£700 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Can you drive with P2177?
Yes short-term, but a lean turbo petrol engine under load risks detonation.
Urgency: medium.