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Old 12-31-2013, 03:07 PM   #1
mtshum
 
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Check engine code P0138

My check engine light on, error code P0138.

check engine light was off this morning, is it still ok to drive?

If need to replace it, is it hard?

My car is 2005 Echo

Thanks.
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Old 12-31-2013, 03:35 PM   #2
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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.
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Old 12-31-2013, 04:55 PM   #3
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Old 12-31-2013, 09:33 PM   #4
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Quote:
Originally Posted by CTScott View Post
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?
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Old 01-01-2014, 01:42 AM   #5
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Originally Posted by mtshum View Post
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.
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Old 01-02-2014, 11:07 PM   #6
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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
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Old 01-02-2014, 11:58 PM   #7
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Originally Posted by mtshum View Post
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.
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Old 02-01-2014, 01:32 PM   #8
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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.. ~~
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Old 12-18-2015, 08:33 AM   #9
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Going to bump this one old thread and ask: Any harm in driving the car with P0138 for a longer period? My car seem to work fine and MPG is average. Can I wait it out or should I not?

Thanks!
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Old 12-18-2015, 10:46 PM   #10
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Going to bump this one old thread and ask: Any harm in driving the car with P0138 for a longer period? My car seem to work fine and MPG is average. Can I wait it out or should I not?

Thanks!
No real harm in doing so. The purpose of the sensor is to show that the cat is still in place and that its catalyst is still good.
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