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Old 02-16-2018, 02:03 PM   #2
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,460
 

2003 L-Series 3.0L Sedan
Default Re: P0404 that fails to respond to changing the EGR...

When the egr valve was left off, did the engine free rev immediately to programmed rev limit (4500)? This test is to check for a blocked intake port with exhaust deposits preventing exhaust gases from entering the intake manifold. The exhaust port should be blowing carbon deposits from high revs.

Anecdotal info that may or may not apply here. I replaced an O2 sensor to a Nissan Sentra with an NTK brand. The O2 error code returned and was puzzled. In the end, the car was brought to a shop and the sensor was replaced with a Denso brand and extinguished the error and passed state inspection. The difference in brands was just a few dollars........

Some aftermarket parts aren't compatible although they're listed as direct replacements for OEM parts. Used original parts from a junk yard sometimes helps while keeping costs down.
Attached Files
File Type: pdf DTC P0404.pdf (149.7 KB, 7 views)
File Type: pdf DTC P0404-1.pdf (100.8 KB, 4 views)

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