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1998 Cadillac Seville 02 Sensor


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Hi Everyone,

I'm new to the Caddyinfo.com, so please bear with me if this message is in the wrong location. I just got my hands on a 98 Seville SLS with 137K miles. When I picked the car up it didn't start right up, but the car had been sitting for a couple of months. I ran the codes and it comes up with a PCM 153 code which is the Bank 2 Sensor 1 for the 02 Sensor. I called Cadillac to find out where the sensor is and was told it was on the right side of the engine bay. I had the sensor replaced and needless to say I'm having the same problem. The car doesn't start right up after sitting for more than 5 mins. And white smoke emits from the tailpipe. I'm still getting the same PCM 153 code, which makes me think I replaced the wrong sensor. Please help?? Where is the sensor that needs to be replaced???

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