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My engine light only comes on sometimes. I took to get inspected today and it read code P0133. What is this and how am I going to pay to get this fixed?

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PO133 indicates that your front oxygen sensor is not controlling the engine properly .. thats usually a bad oxygen sensor .... in some cars thats easy to change. you could do it if you have any mechanical abilities .. in other cars its nearly impossible, it takes special tools and patients beyond human .. hopefully yours is one of the easy ones .. the part itself might be less than a hundred bucks at an auto parts store but more than that at a dealership . other things that can cause this ... if the wires going to the oxygen sensor are damaged .. and if there is a significant exhaust leak (you should hear that) .. usually changing the oxygen sensor will fix the problem has wires going to it and it screws into the exhaust system somewhere between the engine and the catalytic converter. if you give your auto parts store the make, model, year and engine size of your car then they can probably show you where to find the sensor .. if you are not mechanically inclined then find a mechanic with a good reputation forget lowest price .. i find that often the auto parts store can recommend someone if you ask ..

Posted on Jul 03, 2010


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Check engine light on after replacing original oxigens sensors P0153,p0133. Could it be the computer?

I doubt it. Code 133 is for the O2 sensor that covers cylinders one and four, and code 153 covers cylinders two and three. The codes mean the sensors are slow to change. The sensors are supposed to change from lean to rich and back several times per minute.
When the O2 sensors read rich, the computer slows down the injectors, then when they read lean, the computer opens the injectors faster.
The problem could be a lack of fuel, too much fuel, or the engine is not reaching normal operating temp among other things.
You would need to use a scanner to watch the data stream to find out whats happening with the sensors and injectors. The computer would be the last choice for a cause.

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P0401 is EGR valve, low circulation detected.
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All these codes are emissions related, so i would start with the EGR valve, it's probably clogged with carbon. The catalytic converter could be also, check that for excessive backpressure. The oxygen sensor can be tested, replace if needed. Good luck, i hope this helps.

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I took my car with a code failure p0133 they said I didnt need a new sensor but thay can fix it now after 3 months the engine light is back on and they said I must pay again. Someone said if I knew where...

some times the sensor is doing what bit is supposed To telling you that there is some thing wrong , reading out put, it isn't always the sensor , i have hear you can git your car scanned at Auto zone for free . that is true here .you can also buy a scanner that reads codes Farley cheap at most parts stores , and they come with instructions that tell you how to test 1&2& 3 wires sensors hope this is help full ,PS i have had no or Vere little success with cleaning them ,if i can help please let me know Thank you.

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In a Saturn SL2 1998, I have the check engine soon light on. The codes readings show P0133 and P0422.

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