Evaluating display zone 32, display zones 1 and 2 - Oxygen sensor learned values

WARNING: This page is about a different variant/trim than selected.

Appears on display	Possible cause	Corrective action
Low oxygen sensor learned values	Low learned values at idling but with normal learned values at part throttle: possible oil dilution (high level of fuel in oil)	Disappears after motorway drive or oil change
	Injector leaking	Check injector → Injectors, checking
	Fuel pressure too high	Check fuel pressure regulator and holding pressure → Fuel pressure regulator and holding pressure, checking
	EVAP canister purge regulator valve permanently open	Check EVAP canister purge regulator valve → Output Diagnostic Test Mode (function 03), performing , Output Diagnostic Test Mode
	Mass Air Flow (MAF) sensor faulty	Check Mass Air Flow (MAF) sensor → Mass Air Flow (MAF) Sensor G70 , checking
	Oxygen sensor heating faulty or oxygen sensor soiled	Check oxygen sensor heating → Oxygen sensor heating for oxygen sensor before catalyst, checking

Appears on display	Possible cause	Corrective action
High oxygen sensor learned values	High learned values at idling speed, not so high learned values at part throttle: possible unmetered air in area of intake manifold	Check intake air system for leaks → Intake air system (unmetered air), checking for leaks
	Unmetered air between Mass Air Flow (MAF) sensor and throttle valve	Repair cause
	Injector blocked	Check quantity injected rate → Injectors, checking
	Display zones 1 and 2 high: Mass Air Flow (MAF) sensor faulty	Check Mass Air Flow (MAF) sensor → Mass Air Flow (MAF) Sensor G70 , checking
	Fuel pressure too low	Check fuel pressure regulator and holding pressure → Fuel pressure regulator and holding pressure, checking
	Unmetered air at exhaust manifold gasket
	Oxygen sensor heating faulty or oxygen sensor soiled	Check oxygen sensor heating → Oxygen sensor heating for oxygen sensor before catalyst, checking