CEL P0139 - Heated Oxygen Sensor (HO2S) Slow Response Bank 1 Sensor 2
#1
CEL P0139 - Heated Oxygen Sensor (HO2S) Slow Response Bank 1 Sensor 2
Hello All,
Got my first CEL on my 2010 Honda Fit (base/auto). Before I go out and buy a new o2 sensor I had a couple questions for you.
1) Which sensor is this? I'm assuming the rear one?
2) Could this be something else (should I test for other stuff before buying sensor?) I read it could be something to do fuel pressure/injectors/vacuum leaks/exhaust leaks.
3) Should I get a genuine honda part or are there aftermarket ones that are just as good?
4) Any suggestions on where to buy the parts from? I have to get a few other things as well and would like to save money.
Thanks for your help
Got my first CEL on my 2010 Honda Fit (base/auto). Before I go out and buy a new o2 sensor I had a couple questions for you.
1) Which sensor is this? I'm assuming the rear one?
2) Could this be something else (should I test for other stuff before buying sensor?) I read it could be something to do fuel pressure/injectors/vacuum leaks/exhaust leaks.
3) Should I get a genuine honda part or are there aftermarket ones that are just as good?
4) Any suggestions on where to buy the parts from? I have to get a few other things as well and would like to save money.
Thanks for your help
#2
Get a Denso O2 sensor. The universal sensors are NOT wide-band and the code will come back.
Rock Auto sells these at good prices (but I would reference the number for the Fit on the Denso site to make sure you have the correct one, first)
You need to post the actual code. Usually the first sensor sets a CEL before the second one. The second sensor monitors catalytic converter efficiency, if its a P0420 (and you lived with the misfire/stutter that many Fits experience) your cat-con could be bad.
Rock Auto sells these at good prices (but I would reference the number for the Fit on the Denso site to make sure you have the correct one, first)
You need to post the actual code. Usually the first sensor sets a CEL before the second one. The second sensor monitors catalytic converter efficiency, if its a P0420 (and you lived with the misfire/stutter that many Fits experience) your cat-con could be bad.
#4
D'Oh! Stop hiding it in plain sight.
I looked here:
OBD-II Trouble Code: P0139 Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)
I've not seen this as a common problem on Fits but it could be a bad or broken sensor wire.
Part number: 36532-RB1-004 Tres Expensive! $121 USD
It's right at the bottom (#14) so it COULD have damaged wires
So it's confirmed, on the Fit it's the lower (post-Cat) sensor.
Rock Auto has NTK (AKA NGK) sensor for ~$63
Denso @ RA is more $$ than than Bernardi @ $147
I'd have a look before purchasing anything, wires can be repaired....
I looked here:
OBD-II Trouble Code: P0139 Oxygen Sensor Circuit Slow Response (Bank1, Sensor2)
I've not seen this as a common problem on Fits but it could be a bad or broken sensor wire.
Part number: 36532-RB1-004 Tres Expensive! $121 USD
It's right at the bottom (#14) so it COULD have damaged wires
So it's confirmed, on the Fit it's the lower (post-Cat) sensor.
Rock Auto has NTK (AKA NGK) sensor for ~$63
Denso @ RA is more $$ than than Bernardi @ $147
I'd have a look before purchasing anything, wires can be repaired....
#6
Did replacing your downstream oxygen sensor after the catalytic converter fix your problem? Thank you
Hello All,
Got my first CEL on my 2010 Honda Fit (base/auto). Before I go out and buy a new o2 sensor I had a couple questions for you.
1) Which sensor is this? I'm assuming the rear one?
2) Could this be something else (should I test for other stuff before buying sensor?) I read it could be something to do fuel pressure/injectors/vacuum leaks/exhaust leaks.
3) Should I get a genuine honda part or are there aftermarket ones that are just as good?
4) Any suggestions on where to buy the parts from? I have to get a few other things as well and would like to save money.
Thanks for your help
Got my first CEL on my 2010 Honda Fit (base/auto). Before I go out and buy a new o2 sensor I had a couple questions for you.
1) Which sensor is this? I'm assuming the rear one?
2) Could this be something else (should I test for other stuff before buying sensor?) I read it could be something to do fuel pressure/injectors/vacuum leaks/exhaust leaks.
3) Should I get a genuine honda part or are there aftermarket ones that are just as good?
4) Any suggestions on where to buy the parts from? I have to get a few other things as well and would like to save money.
Thanks for your help
#8
thank you for your reply,
I meant to also ask did your car have any symptoms when it was throwing the code or was it just the code itself? Any stalling or rough idle or delayed pedal response or any symptoms at all that went away after replacing the 02 sensor??
Thanks Again
edit: Oh nvm I guess you said there was no noticeable difference in driving. So there were never any symptoms, but replacing the downstream sensor made the code disappear forever. Huh
Last edited by MagicalSeats; 07-16-2022 at 04:20 PM.
#9
I have read in other posts that you should always replace an O2 sensor that matches the one you are Not replacing.
OR replace both of them, and go with Bosch even though it's more $, it's less trouble down the road.
Good luck,
michel
OR replace both of them, and go with Bosch even though it's more $, it's less trouble down the road.
Good luck,
michel
#11
OBD sensor code PO139
thank you for your reply,
I meant to also ask did your car have any symptoms when it was throwing the code or was it just the code itself? Any stalling or rough idle or delayed pedal response or any symptoms at all that went away after replacing the 02 sensor??
Thanks Again
edit: Oh nvm I guess you said there was no noticeable difference in driving. So there were never any symptoms, but replacing the downstream sensor made the code disappear forever. Huh
I meant to also ask did your car have any symptoms when it was throwing the code or was it just the code itself? Any stalling or rough idle or delayed pedal response or any symptoms at all that went away after replacing the 02 sensor??
Thanks Again
edit: Oh nvm I guess you said there was no noticeable difference in driving. So there were never any symptoms, but replacing the downstream sensor made the code disappear forever. Huh
Car ran ok before and after.
Code went away, car's inspected now.
Michel
#14
OBD sensor code PO139
thank you for your reply,
I meant to also ask did your car have any symptoms when it was throwing the code or was it just the code itself? Any stalling or rough idle or delayed pedal response or any symptoms at all that went away after replacing the 02 sensor??
Thanks Again
edit: Oh nvm I guess you said there was no noticeable difference in driving. So there were never any symptoms, but replacing the downstream sensor made the code disappear forever. Huh
I meant to also ask did your car have any symptoms when it was throwing the code or was it just the code itself? Any stalling or rough idle or delayed pedal response or any symptoms at all that went away after replacing the 02 sensor??
Thanks Again
edit: Oh nvm I guess you said there was no noticeable difference in driving. So there were never any symptoms, but replacing the downstream sensor made the code disappear forever. Huh
Car ran ok before and after.
Code went away, car's inspected now.
Michel
Honda price was close to NAPA parts store price and I was in the area, so.....
#15
Honda part
If you buy the "honda OEM part" you're paying a lot more for the same part.
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