Evaluation display group 32, display field 2 through 4- oxygen sensor adaptation values

WARNING: This page is about a different car, the 2001 Volkswagen Jetta, 2001 Volkswagen Golf, 2000 Volkswagen Jetta, 2000 Volkswagen Golf, and 2000 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.

Indicated on display	Possible cause	Corrective action
low oxygen sensor adaptation values	Low adaptation values at idle with normal adaptation values at partial throttle: Possible oil thinning (high fuel level in oil)	Improves after highway driving or oil change
	Fuel injector not properly sealed	Check fuel injector. Refer to Injectors, checking
	Fuel pressure too high	Check fuel pressure regulator and residual pressure. Refer to Fuel pressure regulator and holding pressure, checking
	Evaporative Emission (EVAP) canister purge regulator valve always open	Check Evaporative Emission (EVAP) Canister Purge Regulator Valve. Refer to Output Diagnostic Test Mode (DTM), initiating , Output Diagnostic Test Mode (DTM)
	Mass Air Flow (MAF) sensor faulty	Check Mass Air Flow (MAF) sensor. Refer to Mass Air Flow (MAF) sensor -G71-, checking
	Oxygen sensor heating faulty or oxygen sensor dirty	Check oxygen sensor heating. Refer to Oxygen sensor heating for Heated Oxygen Sensor (HO2S) -G39-, checking

Indicated on display	Possible cause	Corrective action
high oxygen sensor adaptation values	High adaptation values at idle with adaptation values at partial throttle that are not as high: Possible false air in area of intake manifold	Check intake system for proper seal. Refer to Intake air system, checking for leaks (unmetered air)
	False air between Mass Air Flow (MAF) sensor and throttle valve	Repair cause
	Fuel injector clogged	Check ignition quantity. Refer to Injectors, checking
	Display fields 1 and 2 high: Mass Air Flow (MAF) sensor faulty	Check Mass Air Flow (MAF) sensor. Refer to Mass Air Flow (MAF) sensor -G71-, checking
	Fuel pressure too low	Check fuel pressure regulator and residual pressure. Refer to Fuel pressure regulator and holding pressure, checking
	False air at exhaust manifold seal
	Oxygen sensor heating faulty or oxygen sensor dirty	Check oxygen sensor heating. Refer to Oxygen sensor heating for Heated Oxygen Sensor (HO2S) -G39-, checking