tjr19136

My engine light is on and I notice the car isnt as powerful as before, but the engine light goes off in very cold weather and comes back on when the weather warms up............Also when driving at high speeds or going up hills the engine light blinks and the car at a little funny.

jonnik

Year? Engine? Did you pull the codes?

rhandwor

In my area Auto Zone and Advanced Auto will pull the codes free.

tjr19136

1997 Chevy Malibu

I went to my local autozone and got the codes..........I had a cylider mis-fire and 02 sensor failure.............I replace all my spark plugs and my wires. I notice that all the spark plugs were either rusty or burnt-out, and different brands. My wires were were also no good........... But where are the 02 sensors located.............

Streetwise

It sounds to me that if you got a 02 sensor code, and it has issues when it warms up, there is your problem. When the sensor is not working correctly, the system will work as if the car is warming up, using a richer mixture of fuel. The sensor is located on the exhaust system, there are 2. The upstream sensor is located before the catalytic converter. The downstream sensor is found after the converter, meaning further down the exhaust system towards the rear of car. When you had the car scanned, it will tell you which it is. For example, I had the same issue and the scan indicated low voltage in bank one of two. Remember the sensor produces no voltage when it is below normal operating temperature, so you might have fuel economy issues etc. To remove the sensors, warm the car up for a few minutes, 2 or 3. It will be easier to take them out. When you replace them, use an anti seize lube. A slotted socket is recommended so the wire harness fits into the slot during removal, disconnect the plug 1st. But, I think I used a wrench.

bearcatdon

If you go buy your sensor at Auto Zone, they have the slotted socket on the tool loan program.