Regarding the engine light
My check engine light keeps coming on and going off. a friend put a machine on the car Chevrolet dealer and was told that it was a C O 2 sensor(P135 sensor). I am in need of clarity since I was also told by the dealer maintenance personnel that the cost of this repair is $92. thru $174.00 . What is a P135 sensor and what does it usually cost to replace and how long does it take? Is this a warranty item?, and is their maintenance time line I should check on to make sure that I am maintaining my car properly.