Question about 1998 Cadillac Seville

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Codes for 2001 cadillac seville

I found the codes for my cadillac seville that my oxygen sensors are telling me which ones are bad. Question is are they the front or the back ones, they are P0171 System to lean (bank 1)(2) and P0174 System too lean (bank 2). can anyone help with the codes, any advise will help me. Thanks David

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  • davmobe Apr 16, 2009

    i checked out the whole engine for an air leak and can't come up with anything, but the codes can help pinpoint it if any one knows what they are.

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Oxygen sensors are fine you have a air leak check intake for leaks start with checking all inlet pipes rubber hoses if ok check fuel press if ok most likely mass air flow sensor i am leaning toward air leak.

Posted on Apr 16, 2009

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What is the codepo135


PO135 is an (O2) Oxygen Sensor Fault (http://www.obd-codes.com/p0135)

PO153 is an (O2) Oxygen Sensor Fault (http://www.obd-codes.com/p0153)

PO174 is "Too Much (O2) Oxygen in Exhaust" (http://www.obd-codes.com/p0174)

PO300 is "Random / Multiple Misfire" (http://www.obd-codes.com/p0300)

It would seem these are all related to one or more spark plugs NOT firing. Since it isn't firing, Oxygen (O2) is being detected in the exhaust - when Carbon Monoxide (CO) is expected. Other sources of high O2 can be cracked manifold, exhaust pipes, etc. Good luck!

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Just bought a 93 Seville STS about a month ago, which ran great the first few weeks. But now, when i'm driving, it stalls & sputs like it's running out of gas even though the tank is full. When...


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In most cases the front o2 sensors fails , there is one on the left and one on the right of the exhaust pipes. It could be one or both of them. Would need to know what the engine code for this or change both of them. Let me know and i can help.

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