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Discussion Starter #1
My daughters car (2006 Saturn Ion Level 2 - 108,000 miles) starting running rough for a while but then would run fine. I pulled the codes and got a P0326 so I replaced the knock sensor. Next day same problem, pulled the codes again and got a misfire code. Replaced the coil pack and it runs fine. EXCEPT now then Check Engine light comes on and I get P0420 (Cat Efficiency Below Threshold), P0326 (Knock Sensor Range/ Performance) and P0106 (MAP Range/Performance). I am beginning to think there is a power and/or ground issue. Any thoughts where I can start looking?
 

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Do you have a multimeter/oscilloscope?
 

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Start tracing. I would recommend a good bit of time to cleaning grounds first though. Silicone paste is your friend.
 

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Sounds like a clogged cat to me. Is the car choking?
 

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Discussion Starter #7
starting troubleshooting at the battery and found it had a dead cell. Replaced the battery and the check engine light has not yet come back on.
 
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