okay, so i had a bad knock sensor which i changed and the difference is unbelievable

BUT

i had the 02 sensor code so i changed that. . . cleared my SES light . . .today it comes back. . . same code, same sensor...

DID I do something wrong?

Help guys!

 

Which one did you change, a front one or the rear? Should have changed both in the front. Did you reset the ECU also, disconnect the battery before you started?

What is the code btw

 

0135 is the code. . . does that mean that i should have changed both?

 

forget it. . .i know what the problem is. . .even though it's one code, it's still 2 sensors. . .autozone guy told me that no no no it's only the first one. . .

thanks

 

0901
Diagnostic Trouble Code 0901 points to a problem with the Front Heated Oxygen Sensor, Right Bank. The right cylinder bank is also called the rear bank. It is cylinders 1,3,5.

The Front Heated Oxygen Sensors are installed in the Y-pipe, the part of the exhaust system which conveys exhaust gases from the exhaust manifolds to the Catalytic Converter. There is an Oxygen Sensor in each branch of the Y-pipe. These sensors produce a signal which varies with the concentration of oxygen in the exhaust gas, as compared to the outside air. This signal is sent to the Engine Control Module which uses it to control the fuel injection system.

DTC 0901 is detected when the current drawn by the heating element in the Oxygen Sensor is out of the normal range.
Possible causes include ...
- harness or connectors (the sensor circuit is open or shorted.)
- a defective Front Heated Oxygen Sensor (right bank).


The heated Oxygen Sensors have two components: a heating element and a sensing element. The heating element may be tested with an ordinary ohmmeter. This test is done with the engine off.

Follow the wires away from the Oxygen Sensor until you find the nearest electrical connector. Disconnect the connector. Viewed with the connector latch at the 12 o'clock position, there are three terminals. They are numbered 1-3, right to left. Be sure to measure the terminals in the connector half which is attached to the Oxygen Sensor, not the one which leads to the Engine Control Unit.

Measure the resistance between terminals 1 and 3.
The factory spec is 2.3-4.3 ohms at 77 degrees Fahrenheit.

Measure the resistance between terminals 1 and 2.
The reading should be infinity (no connection).

Measure the resistance between terminals 2 and 3.
The reading should be infinity (no connection).

If the resistance measurements are significantly different from the factory specifications the sensor is faulty and must be replaced.

If the resistance measurements meet the factory specifications the sensor may be good and the wiring is defective. You could exchange the two Front Heated Oxygen Sensors and reset the Engine Control Module. Then drive normally and expect the Malfunction Indicator Lamp to turn on again. If you still get DTC 0901 the wiring is faulty. If you get DTC 1001 the sensor is bad.

 

It's the same one I just replaced Sam. It's the one closest to the front of the car. If the car has close o 100k miles I'd replace both of them at the same time.

 

The harness might be bad, read my post.

 

i changed the other one & it's all good now.
Thanks.