Evaluating display zone 32, display zones 1 and 2 - Oxygen sensor learned values
WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2005 Volkswagen Jetta, 2005 Volkswagen GTI, 2004 Volkswagen Jetta, 2004 Volkswagen GTI, and 2003 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
| 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)
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- Disappears after motorway drive or oil change
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- EVAP canister purge regulator valve permanently open
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- Mass Air Flow (MAF) sensor faulty
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- Oxygen sensor heating faulty or oxygen sensor soiled
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| 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
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- Unmetered air between Mass Air Flow (MAF) sensor and throttle valve
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- Display zones 1 and 2 high: Mass Air Flow (MAF) sensor faulty
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- Unmetered air at exhaust manifold gasket
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- Oxygen sensor heating faulty or oxygen sensor soiled
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