'12 F with Borla catback...getting CEL P0137. Help!
#1
'12 F with Borla catback...getting CEL P0137. Help!
So I bought LOLM3's old Borla a while back & everything's been great except CEL P0137 & the VSC light keeps popping up on me every 30-40 miles. I have a 12' with 20k miles on the odo.
P0137:
O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2)
It has secondary cats welded on along with these type of O2 defoulers so the O2 sensors can reach the re-located bungs (except they're welded, not screwed on):
I've swapped sensor 1's with bank 2's sensor & even went ahead & replaced it with a brand new one, same code keeps popping up . Resetting the light is getting old & inspection time is coming up!
There are no audible exhaust leaks as far as I can tell, would a minor leak throw the CEL?
Should I cut out the secondary cats & replace with straight piping like how the exhaust was originally made?
I'll get some actual pics of the setup later, any suggestions/help is appreciated!
***UPDATE 10/15***
Finally had a chance to run by a muffler shop......chopped off the cats & defoulers/O2 extenders, problem solved! Turns out the defouler/extender on the bank 1 side was welded very ****ty, it had a tiny hole exposed causing a leak near the sensor. How LOL M3 didn't have a CEL, I have no idea but problem solved. Thanks every one!
_____________________________
P0137:
O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2)
It has secondary cats welded on along with these type of O2 defoulers so the O2 sensors can reach the re-located bungs (except they're welded, not screwed on):
I've swapped sensor 1's with bank 2's sensor & even went ahead & replaced it with a brand new one, same code keeps popping up . Resetting the light is getting old & inspection time is coming up!
There are no audible exhaust leaks as far as I can tell, would a minor leak throw the CEL?
Should I cut out the secondary cats & replace with straight piping like how the exhaust was originally made?
I'll get some actual pics of the setup later, any suggestions/help is appreciated!
***UPDATE 10/15***
Finally had a chance to run by a muffler shop......chopped off the cats & defoulers/O2 extenders, problem solved! Turns out the defouler/extender on the bank 1 side was welded very ****ty, it had a tiny hole exposed causing a leak near the sensor. How LOL M3 didn't have a CEL, I have no idea but problem solved. Thanks every one!
_____________________________
Last edited by prada_g; 10-15-14 at 09:39 PM.
#2
Also possible causes from Googling:
- Rear Heated Oxygen Sensor harness is open or shorted
- Rear Heated Oxygen Sensor circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor
- Incorrect fuel pressure
- Faulty fuel injectors
- Exhaust manifold leaks
- Rear Heated Oxygen Sensor harness is open or shorted
- Rear Heated Oxygen Sensor circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor
- Incorrect fuel pressure
- Faulty fuel injectors
- Exhaust manifold leaks
#4
Lexus Test Driver
iTrader: (10)
So I bought LOLM3's old Borla a while back & everything's been great except CEL P0137 & the VSC light keeps popping up on me every 30-40 miles. I have a 12' with 20k miles on the odo.
P0137:
O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2)
It has secondary cats welded on along with these type of O2 defoulers so the O2 sensors can reach the re-located bungs (except they're welded, not screwed on):
I've swapped sensor 1's with bank 2's sensor & even went ahead & replaced it with a brand new one, same code keeps popping up . Resetting the light is getting old & inspection time is coming up!
There are no audible exhaust leaks as far as I can tell, would a minor leak throw the CEL?
Should I cut out the secondary cats & replace with straight piping like how the exhaust was originally made?
I'll get some actual pics of the setup later, any suggestions/help is appreciated!
P0137:
O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2)
It has secondary cats welded on along with these type of O2 defoulers so the O2 sensors can reach the re-located bungs (except they're welded, not screwed on):
I've swapped sensor 1's with bank 2's sensor & even went ahead & replaced it with a brand new one, same code keeps popping up . Resetting the light is getting old & inspection time is coming up!
There are no audible exhaust leaks as far as I can tell, would a minor leak throw the CEL?
Should I cut out the secondary cats & replace with straight piping like how the exhaust was originally made?
I'll get some actual pics of the setup later, any suggestions/help is appreciated!
#6
Lol yeah I actually started this thread after I saw the one you started.
#7
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So I bought LOLM3's old Borla a while back & everything's been great except CEL P0137 & the VSC light keeps popping up on me every 30-40 miles. I have a 12' with 20k miles on the odo.
P0137:
O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2)
It has secondary cats welded on along with these type of O2 defoulers so the O2 sensors can reach the re-located bungs (except they're welded, not screwed on):
I've swapped sensor 1's with bank 2's sensor & even went ahead & replaced it with a brand new one, same code keeps popping up . Resetting the light is getting old & inspection time is coming up!
There are no audible exhaust leaks as far as I can tell, would a minor leak throw the CEL?
Should I cut out the secondary cats & replace with straight piping like how the exhaust was originally made?
I'll get some actual pics of the setup later, any suggestions/help is appreciated!
P0137:
O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 2)
It has secondary cats welded on along with these type of O2 defoulers so the O2 sensors can reach the re-located bungs (except they're welded, not screwed on):
I've swapped sensor 1's with bank 2's sensor & even went ahead & replaced it with a brand new one, same code keeps popping up . Resetting the light is getting old & inspection time is coming up!
There are no audible exhaust leaks as far as I can tell, would a minor leak throw the CEL?
Should I cut out the secondary cats & replace with straight piping like how the exhaust was originally made?
I'll get some actual pics of the setup later, any suggestions/help is appreciated!
the pipe may work on some cars and not others, toyota's don't respond well to this method cat delete most of the time you will need some kind of micro processor controlled O2 sensor delete.
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#8
remove that pipe and your problems will be solved, if you remove the O2 sensor from the path of exhaust flow it will read less O2 the result will be low voltage the ecu will try to make it switch by adding more fuel and when it does not. you will get this code.
the pipe may work on some cars and not others, toyota's don't respond well to this method cat delete most of the time you will need some kind of micro processor controlled O2 sensor delete.
the pipe may work on some cars and not others, toyota's don't respond well to this method cat delete most of the time you will need some kind of micro processor controlled O2 sensor delete.
I'll give it a shot, I PM'd LOL M3 and he said he didn't have any issues with this setup on his own car. I was hoping I wouldn't have to spend anymore $ getting this cleared up. I'm thinking maybe the sensor isn't getting enough exhaust gases to read? But then the bank 2 sensor has the same defouler on it but no cel there :/.
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