Home Tips & Tricks 2001 Mazda Tribute The Malfunction Indicator Lamp (MIL) is on, Powertrain Control...

2001 Mazda Tribute The Malfunction Indicator Lamp (MIL) is on, Powertrain Control Module (PCM) sets code P0402

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Download Tests/Procedures: Potential Causes: 1. Some vehicles may exhibit a malfunction indicator lamp (MIL) “ON” with or without the following symptoms: Rough Running, Lack of Power, Surge or Poor Fuel Economy, along with diagnostic trouble codes (DTC’s) P0401, P0402, P1400 or P1401. This may be caused by an intermittently functioning tube-mounted Delta Pressure Feedback EGR (DPFE) sensor. 2. For vehicles equipped with a tube-mounted DPFE sensor, perform the following diagnostic procedure and repair action. This procedure supersedes the diagnostic procedure in the PC/ED Manual for the issue described above. Defective Differential Pressure Feedback EGR (DPFE) Sensor