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Po133 o2 circuit slow bank1, snesor 1 Where is this sensor located?

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There are 4 such sensors on your car. this sensor is on the passenger side of the car just below where the exhaust manifold attaches to the exhaust pipe. There is a similar one on the driver's side and the other two are downstream of the catalytic converters. See picture below and let me know if you have more questions.

po133 o2 circuit slow bank1, snesor 1 Where is - jturcotte_178.gif

Posted on Nov 14, 2010

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Check enegine light stay s on all the time, here are the codes im getting, if someone could tell me how to fix these that would be great. p0155 p0141 p0136 p0443 p1451 p0135 p0161 p1409


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P0141: O2 Sensor heater Circuit Malfunction (bank1 ) Sensor 2.

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What is nissan quest code p0138/p0139


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The Heated Oxygen Sensor (1 or 2) located rear of catalytic converter produces an output signal relative to oxygen storage capacity of catalytic converter. Ho2S 2 signal is less active than signal produced by front oxygen sensor. This code sets when HO2 Sensor voltage is greater than 999 mV for more than 2 minutes (time depends on model. Could be as high as 4 minutes)

Symptoms: There may be no noticeable symptoms except for MIL illumination. Possible high fuel pressure can over rich the system.

Causes: A code P0138 may mean that one or more of the following has happened:
* Faulty O2 sensor
* Short to battery voltage in O2 sensor signal circuit
* High fuel pressure (not as likely)

Here are some potential solutions:
* Replace O2 sensor
* Repair short to battery voltage in o2 sensor signal circuit

Hope helps (remember to rate this answer).

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Follow your exhaust piping from the engine to the tailpipe and you should find them. They're the only things on the exhaust with wires running to them.

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