Disconnect both O2 sensors (front and rear), start engine and let idle
Volkswagen technical service bulletin TT261402 for 2009-2015 Volkswagen Jetta, 2009-2015 Volkswagen Passat and 2010-2015 Volkswagen Golf and others.
- Bulletin number
- TT261402
- Component
- Engine and engine cooling
- Summary
- Disconnect both O2 sensors (front and rear), start engine and let idle. Check MVB's 41/4 and 136/4 and verify have both changed from a 1 to a 0 (you may have to drive the car 4 miles to get them to reset to 0). Also a key cycle may be required for values to reset. This forces the ECM to re-learn the O2 sensor adaptation. Once MVB 41/4 and 136/4 read 0, re-connect the O2 sensors, road test and recheck for faults.
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