Hi,
Im in need of help, my service ingine soon light when on, i took it in to get diagnosed they replaced the intake manafold gasget and the catalytic. i figured that would solve my problem but the light came back on. i dont know what else should be replaced?

 

Go to any AutoZone store. They will read the codes and tell you the probable cause, for free.

 

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Where did you have the vehicle repaired? Year / model of vehicle?

Louis
GM Customer Service