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2012
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528xi
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Repair and Diagnosis
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Engine Performance
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Testing & Diagnosis
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Self Diagnosis - Diagnostic Trouble Codes (N20 & N26)
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Fault Code Tests
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DTC P2421: BMW DTC 191A21; DME -- EVAP System Vent Valve Stuck Open
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Service instruction
Service instruction
If fault codes are still logged after replacement of the fuel tank vent valve, check DMTL by running the DMTL system check.