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Hey All, Recently I had check engine light in 99 camry withh 70K miles on it. The code was P1135 and P1133 and the mechanic replaced the air-fuel ratio sensor. The mechanic did mention that my previous air-fuel ratio sensor doesnt look corroded or bad but he thought it would be a good idea to change the sensor. (because of the codes)

I drove the car for a week and the CEL came back on again with same codes. I trust the mechanic so I dont suspect any foul play there. What the mechanic is saying is either I have a wiring issue somewhere or there is some other thing bad like EGR valve or the worst that my computer needs to be replaced. Any suggestions...... Thanks in advance.

Reply to
learnfpga
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I really doubt it's any of the other options your mechanic listed. First, verify that the sensor replaced was indeed a toyota air-fuel ratio sensor and not a regular oxygen sensor. The price of the part should tip you off. The AF sensors are in the $200 range normally. Second, if the part is correct, you should find a technician that can access the data list in the vehicle and interpret the readings. A competent tech should be able to look at the inputs and determine what is causing the AF sensor readings. Don't start winging parts at the car until you get it diagnosed, it can get really expensive.

Reply to
qslim

I am sure it is an air fuel ratio sensor. The main difference like you said is the cost. O2 sensor can be purchased at autozone made by Denso or Bosch and is usually about 99 bucks. Air fuels ratio sensor is about

200 bucks and can only be bought at the dealer. Thanks for the info though.....
Reply to
learnfpga

If a new sensor is giving you the same problems, then check the connector to make sure there is proper voltage that operate the heater. If the sensor is not up to operating temperature, it won't work.

Haynes manual should be able to tell you how to check the wiring connectors and heater resistence.

Reply to
johngdole

Reply to
steve

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