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I'm not understanding the code of 20, your 1997 Saturn has an OBDII computer. you need a code reader to get engine codes. you cannot pull codes manually by shorting terminals A-B anymore. every one of your engine codes is atleast 3 digits, and should start with P. for example: a faulty oxygen sensor with no responce will show a code of P0134, or a EGR with insufficient flow will show a code of P0401.

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My code book shows that an OBDII code of P0020 is a camsharft position actuator circuit bank 2. you have a sensor problem or your cam chain has stretched beyond the tensioner's ability to remove slack. I was getting camshaft position errors and had to replace the cam chain and tensioner.

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Q: Help with my 97 Saturn SL2. SES light comes on at speeds of 50 or higher. I've replaced both O2 sensors. The code reads 20 which is something to do with emissions. Any suggestions?
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