96 Geo Tracker failed test cause of EGR flow.Had EGR Bypass and EGR control valve replaced.After driving car for a week engine light came on.Tested again and failed again cause of EGR flow.Had o2 sensor replaced. Drove for a few days,engine light came on again. Tested again and failed, again for EGR flow and now system too lean.Dealership can‘t find the problem,but recommended I have fuel injector service,engine decarbonization,and new hoses they didn‘t specify which ones.I‘ve spent over a grand trying to fix and I don‘t want to give the dealer any more money because they haven‘t been able to fix it.Trying to qualify for a waiver from the Illinois emissions but they won‘t give it to me unless the engine light is off,it doesn‘t matter if the car fails. What should I do?Can I perform the engine decarbonization and injector service myself, and if so how?and will that even make a difference?Is there a way to turn off the engine light without disconnectin battery to get qualify 4 waiver?
Yes, an exhaust leak can cause problems like this. So try fixing the exhaust from the head to the muffler. You see one gaping hole, there could be others. Considering that this is one of the few cars that you can find new cast exhaust manifolds for that are aftermarket, it would not be surprising if you need one. The gasket/s I suspect are in the exhaust system and not internal the engine.
If I were u,i will remove the bulb which is giving you the run around. Go for the test without the bulb,so light not there to fail you. once passed,u can fix it back. Now this electronic systems can show light for various reasons.From Loose tank caps to Co2 sensors. Even auto transmission sensors show check engine lights. The diagonise will show exact. Only possibilty check auto transmission sensor.This could be the culprit. try the bulb trick and get your vehicle moving.
