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@abss what mods do you have to your car? And yes it might be O2 sensors
thanks for responding Roveron, car is stock. To make long story short filled up with Kroger gas (93) and as soon as I start car CEL comes on. Took car to a small independent MB shop to have it looked at. Mechanic states that right rear 02 sensor is bad, so I replaced the sensor. After a few days everything seemed fine, until today CEL return. I hope a member can point me to the right direction in resolving this issue. Thanks.
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