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Re: GM cat monitor/ monitors setting in order
Posted to Technical Discussion Forum on 9/1/2018 3 Replies

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Jason, I have driven vehicles for days that won't set the P0420, yet I know the cat. is bad. Once I drove a vehicle three days just to prove my point. Finally it set the P0420. A cat. that is on the ... Login to read more.

3 Replies Received (View Replies)