2005 SER SES Light Still on after Pre-Cat replacement

02-01-2012, 11:47 PM
2005 Altima SER with 98K. Dealer told me my rear pre-cat was plugged and was causing the rattle in engine and SES light in my car. Replaced it (old pre-cat was very bad) but SES light still keeps coming on. Rattle is now gone. There are about 5-O2 Sensors in this car. The EGR Valve is, of course, integrated and intricate. Anyone have this similar issue? What can I check first to start eliminating?


05-14-2012, 07:38 PM
Any idea what code is stored for the C.E. light? Is the rattle from the engine and does it change with RPM?

05-15-2012, 09:05 AM
Was the CEL reset & cleared after the new cat?
No - If the problem is resolved, it will clear it self after the drive cycle.
Yes - You got other problems, we need DTC's to analyze problem.

Almost any Auto store will pull codes for free, but don't buy any parts yet.

Write down any other symptoms:
Fuel economy
performance issues

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