P2187 fault code: what it means

P2187: Bank 1 is running lean at idle.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

vacuum leak (hose, gasket, PCV)
dirty or faulty MAF sensor
leaking injector seal
weak fuel pump or blocked filter

P2187 by make

Audi

Running lean at idle. On 2.0 TFSI/TSI, a faulty crankcase breather valve is a known cause (strong vacuum at the oil cap at idle).

Usual causes: faulty crankcase breather / PCV valve; intake air leak after the MAF; leaking or blocked injectors; exhaust leak

BMW

Lean at idle, bank 1. On BMW a crankcase vent valve or intake leak is the usual cause.

Usual causes: split crankcase vent valve membrane; intake or vacuum leak; injector or fuel pressure fault

Haval

System too lean at idle.

Usual causes: vacuum or PCV leak; intake leak; weak fuel supply

Mini

Lean at idle. Crankcase vent valve or intake leak most likely.

Usual causes: crankcase vent valve or rocker cover leak; intake or vacuum leak; injector or fuel pressure fault

Skoda

Running lean at idle. On 2.0 TFSI/TSI, a faulty crankcase breather valve is a known cause (strong vacuum at the oil cap at idle).

Usual causes: faulty crankcase breather / PCV valve; intake air leak after the MAF; leaking or blocked injectors; exhaust leak

Volkswagen

Running lean at idle. On 2.0 TFSI/TSI, a faulty crankcase breather valve is a known cause (strong vacuum at the oil cap at idle).

Usual causes: faulty crankcase breather / PCV valve; intake air leak after the MAF; leaking or blocked injectors; exhaust leak

What the repair usually costs

MAF (mass air flow) sensor replaceNZ$170–NZ$660 · A$160–A$600
PCV valve / oil separator replacementNZ$110–NZ$920 · A$110–A$900
High-pressure fuel pump (GDI petrol or common-rail diesel)NZ$1,140–NZ$4,280 · A$1,060–A$3,800
Engine air filter replacementNZ$40–NZ$130 · A$30–A$120

Not sure what P2187 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.