DOGFACE
Newbie
Sooo... I have put around 1000 miles on a recently purchased '97 Yukon 2 door with Vortec 5.7. 177K miles, with a replaced engine.
A few weeks ago, the check engine light on. A few days ago. the light turned off. Today, it came back on. I checked for codes, which returned faults in all thee 02 sensors.
Does this make sense that all three would go **** up at once, or more likely that all three were bad a long time ago? Or... is there something else to consider?
I plan a complete new dual exhaust in a couple months, and then tune. Should I screw with the sensors now, or just wait will the exhaust is upgrade and knock out in one shot?
A few weeks ago, the check engine light on. A few days ago. the light turned off. Today, it came back on. I checked for codes, which returned faults in all thee 02 sensors.
Does this make sense that all three would go **** up at once, or more likely that all three were bad a long time ago? Or... is there something else to consider?
I plan a complete new dual exhaust in a couple months, and then tune. Should I screw with the sensors now, or just wait will the exhaust is upgrade and knock out in one shot?