Nissan Altima: Flashing Check Engine Light Diagnosis

A flashing check engine light is your Nissan Altima’s way of saying “I have a serious problem, don’t ignore me”. Most of the time, that serious problem is a misfire.  This flashing light should not be ignored.  When your engine is misfiring, it is dumping raw fuel into the exhaust.  This raw fuel can detonate, … Read moreNissan Altima: Flashing Check Engine Light Diagnosis

Nissan Altima: Warm Up Catalyst Efficiency → Below Threshold (Bank2)

P0431 is a standard OBDII trouble code, which means that it has the same meaning for the Nissan Altima as it would any other vehicle.  It is closely related to P0430 (which is one of the most popular OBDII codes). Warm Up Catalyst Efficiency → Below Threshold (Bank 2) When it’s the only trouble code … Read moreNissan Altima: Warm Up Catalyst Efficiency → Below Threshold (Bank2)

Nissan Altima: Warm Up Catalyst Efficiency → Below Threshold (Bank 1)

P0421 is a generic OBDII trouble code.  It has the same meaning for the Nissan Altima as it would any other vehicle.  It is closely related to P0420 (which is the most popular OBD code). Warm Up Catalyst Efficiency → Below Threshold (Bank 1) When it’s the only trouble code present, P0421 will typically not … Read moreNissan Altima: Warm Up Catalyst Efficiency → Below Threshold (Bank 1)

Nissan Altima P0411: Secondary Air Injection System → Incorrect Flow Detected

P0411 is a general OBDII trouble code, which means that it has the same meaning for the Nissan Altima as it would any other car or truck.  By definition, the code is letting you know that the ECM has detected incorrect flow in the secondary air injection system.  P0411: Secondary Air Injection System → Incorrect … Read moreNissan Altima P0411: Secondary Air Injection System → Incorrect Flow Detected