service engine soon light

1998 SATURN SL1
176,000 MILES • 4 CYL • FWD • MANUAL
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LAZYBOOBS2
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  • 1 POST
won't pass inspection..inspectionsays oxygen something fuel something & something else i don't remember .it failed 3 need to get one to work.advance & auto zone checks..we have changed the knox(?)sensor it said first,and also changed spark plugs and cleaned egr valve and ports. light went off for a short time and came back on. now auto zone checksays po404 & po405 fault in the egr position & egr pressure sensor, open or short circuit condition. are there any suggestions you can give us to try? is there such a thing as egr sensor?advance auto did not show on their list,maybe it just isn't something they carry? help please . thanks for your time..
May 3, 2011 at 10:51 PM
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SATURNTECH9
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That sensor is built into the egr valve usually a code p0404 is caused by a dirty sticking valve.But since you also have a P0405 i would diagnose that code i posted the trouble tree for it.You will need a scan tool that can read live engine data to trouble shoot it.You will have to buy or rent a scan tool that can do that or take it somewhere and have them fix it for you.Let me know what you find.
May 3, 2011 at 11:23 PM
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