My car engine light came on autozone check it.

Tiny
ANONYMOUS
  • MEMBER
  • 2003 DODGE CARAVAN
My car engine light came on autozone check it and said it was the oxygen sensor. I waited a few month to fix it cause I did not have the money. Cause I waited my car stated acting funny giving me problems starting sucking up alot of gas etc. Today I got the money to get it fix and was driving to take it in and my car turn off while driving steering wheel lock could not even turn the car to the side of the road. I then try turn the key for the car to turn on but it did not. Just the lights and radio came on. What is wrong with my car know please help.
Tuesday, February 19th, 2013 AT 2:07 PM

1 Reply

Tiny
CARADIODOC
  • EXPERT
You will not lose the steering when the engine stalls. You will just lose the power assist and you'll need both hands to turn the steering wheel. If you aren't familiar with that, try coasting through an empty parking after turning the engine off so you know what to do in an emergency like you just had.

When the Engine Computer detects a problem, it sets a diagnostic fault code. It will also turn on the Check Engine light if that problem could have an adverse affect on emissions. In the case of using more fuel, that increases emissions. Besides the increased fuel consumption, there's another problem with waiting to have it repaired. There is always a long list of conditions that must be met to set a fault code. One of those conditions is that certain other codes are not already set. The computer constantly compares numerous things to each other to figure out when something is wrong. If it sees a problem with a circuit, it knows it can't use that as a reference for other circuits so those other circuits may not get tested while you're driving. When you finally get the first problem fixed, the computer can resume all of its self-tests. That's when a code for a totally new problem could show up and the Check Engine light will turn on again. You just paid to have a problem solved and the light is still on. What you don't realize is this is a new problem that your mechanic had no way of knowing about earlier.

The next thing to be aware of is fault codes never say to replace parts, in this case, one of the oxygen sensors. They only indicate the circuit or system that needs further diagnosis. You didn't list the engine size or mileage so I can't tell you how many different oxygen sensors you have but it will be at least two. If the mileage is relatively low it is much more likely there is a wiring problem related to one of the sensors than a bad sensor. Only diagnosing the circuit will tell for sure. About 50 percent of the time replacing the sensor will not solve the problem.
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Tuesday, February 19th, 2013 AT 3:43 PM

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