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Originally Posted by ErnieC
I have a 97 voyager 2.4 motor. I am getting bad gas milage. The check engine light is giving me code 21. I want to fix it myself. How do I know which O2 sensor is bad, the one in the manifold or the one by the cat?
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Codes do not say replace sensors. They say check things out.
Code 21 can be 4 different problems on the downstream 02 sensor or wiring circuit.
Check all fuses to start with.
You will need the 4 digit P---- codes to know where to check.
Get a good scanner on it and read out data and codes and post back code no.
MT