Question about 1999 Saturn SL

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Have code of po171 on a 1999 saturn sl2 with a 1.9 dohc what is it and how to fix it

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  • Dan
    Dan May 11, 2010

    Before replacing the post-cat O2 sensor, there are a few things to check so that the check engine light code does not pop back on.

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  • 158 Answers

I believe it is an intake leak which is very common on the saturn s series cars. the fix is replacing the intake manifold gasket-book time is about 3.5-4 hours so unless you know what youre doin i suggest takin it to a mechanic.

Posted on May 03, 2010

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There is not a cam sensor on the 1.9 sohc or dohc engine. The ignition module looks at the collapsing magnetic field of the ignition coil to determine cam reference.

Did you mean crank sensor?

Are you coming up with a code for the cam sensor?

If so the fix is usually to remove the coils and ignition module from the transmission. Clean the area they mount to with a scotchbrite pad until all the corrosion is removed. Reinstall the ignition module and coils using new bolts available from saturn/GM. Clear the code.

In some cases the ignition module or the coil or the ignition wires can also cause this code if they are bad.

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The SL2 is a DOHC 1.9L and the SL1 is a SOHC 1.9L. They have different transmissions, the DOHC uses a 15 inch wheel while the SOHC has a 14 inch wheel. So when you are shopping around for another transmission you must get one from the same type of engine. Saturn auto transmissions seem to be problematic, I stuck with the manual trannys and had very good luck.

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