Basically that is a communication code between one or more computers you need a dealer scan tool or something similar like the $8000 snapon scanner to verify which computers are suspect and a DVOM to measure voltage on the communication circuits between the suspect computersNissan Altima P04 OBDII Code Defined P04 is a OBDII trouble code The code technically stands for Catalyst System Efficiency Below Threshold Your Altima has at least two oxygen sensors, one before and after the catalytic converter Among the many jobs that oxygen sensors have is they have to measure the emissions levels coming in and outModel 50 Best Nissan Altima for Sale under $1,000, Savings from $2,069 Created with Sketch Nissan Altima Trim 50 Best Nissan Altima for Sale under $1,000, Savings from $2,069 Created with Sketch
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