Can you ask the dealer what the Diagnostic Trouble Code (DTC) on the check engine light. It starts with a P and then numbers.That P something tells what is wrong with your car.
I have a 99 camry, 220,000 miles and I have never replaced that $700 catalytic converter. If your car is running fine especially on uphill, I do not think there is something wrong with your catalytic converter. Catalytic converter is clogged if no matter how you step on the gas, the car would not run any faster than 50 miles per hour especially uphill.
Maybe when they did the fuel injection treatment, they temporarily triggered the DTC for the catalytic converter or oxygen sensor (temporary) but there is nothing wrong with it. Once the sensor is triggered, the check engine light stays on until it is erased/reset.
Ask the dealer for the DTC (Diagnostic trouble code) of the check engine light, then tell the mechanic to erase/reset the code (to turn off the check engine light on) and see if the check engine light comes back on again by driving around 100 miles. If it comes back on, then there is something wrong with your car (maybe simple thing). Post another topic here with the DTC included and the mechanics or forum members here can help you.
Please click on the link below to give you an idea regarding check engine light.
Thursday, October 9th, 2008 AT 2:42 PM