Saturday, January 20, 2007

P0402 code for 1999 Nissan Altima with 2.4L engine


Have this code P0402-egr control back pressure transducer valve on my Altima and when I tested it, found the egr valve sticking. Replaced the valve and also cleaned the passage tubing going to it. After resetting the code and road testing it, the code light went out. however, after a week of using, the same code came back. I re-check the egr valve and I cannot find anything wrong. Please help.

ATS Advisor:

When testing your egr system, try these:

Check all your egr vacuum hoses for cracks and connection

There is a restrictor inside the vacuum hose for the EGRC-BPT valve, that cam be tested for dirt restrictions due to carbon

The egr valve flow can be tested by lifting the spindle with your finger during idle and the rpm should go lower.

If the above code persists, replace the egrc-bpt valve next to the egr valve.


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