The engine goes lean specifically when you ask for power. Fuel supply that cannot keep up is the classic cause.
P2191 — also written P2191, P 2191, 2191 — is the OBD-II code for system too lean at higher load (bank 1). Same code, same fix: this page covers every spelling of it.
P2191 is a fuel & air fault code, typically costing £80–£800 to put right in a UK garage.
What causes P2191?
- Blocked fuel filter
- Weak fuel pump
- Restricted injectors
- Boost leak opening under pressure
- MAF under-reading at high flow
How P2191 is fixed
- Test fuel pressure at full load, not idle
- Change the fuel filter
- Smoke-test the charge pipework
- Injector clean or flow test
P2191 repair cost in the UK
Most P2191 repairs land between £80–£800 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 P2191?
Drive gently. Sustained lean running under boost can damage pistons.
Urgency: medium.