Check engine code P0138

[CTScott]

P0138 is an error for the second O2 sensor (the one that is after the catalytic converter). It is not too bad to replace, as long as you can get under the car. The other end plugs into a connector under the center console near the gas pedal.

[mtshum]

Originally Posted by CTScott

P0138 is an error for the second O2 sensor (the one that is after the catalytic converter). It is not too bad to replace, as long as you can get under the car. The other end plugs into a connector under the center console near the gas pedal.

Thanks, CTScott, do I need to remove the passenger seat to remove the second O2 sensor?

[CTScott]

Originally Posted by mtshum

Thanks, CTScott, do I need to remove the passenger seat to remove the second O2 sensor?

No. It comes through the floor right under the center of the dash. You will probably have to pull the AC controls to get to it.

[mtshum]

Originally Posted by CTScott

No. It comes through the floor right under the center of the dash. You will probably have to pull the AC controls to get to it.

Hi CTScott,

My check engine light was off this two day, do I still need to change the rear O2 sensor?

also, my car is only 77,000km. is it too early for the sensor to be failed?

Thanks

[CTScott]

Originally Posted by mtshum

Hi CTScott,

My check engine light was off this two day, do I still need to change the rear O2 sensor?

also, my car is only 77,000km. is it too early for the sensor to be failed?

Thanks

You could wait and see if the code comes back. 77k Km does seem early, but there are a few things, including bad fuel that could foul one prematurely.

[mtshum]

Originally Posted by CTScott

You could wait and see if the code comes back. 77k Km does seem early, but there are a few things, including bad fuel that could foul one prematurely.

An update:
The code came back again, so finally replaced the second O2 sensor.

Just discover the left cv boot cracked, need to replace too.. ~~