Hi everyone,
For some reason I've been having an issue recently with my Nitro throwing a P0058 fault code with the description - "HO2S Heater Control Circuit High (Bank 2 Sensor 2)"
Now this has happened after running E10 fuel (10% ethanol, approx. 94 octane) since the car was new (now has 18000kms since 2008) and switching to 95 octane fuel (no ethanol).
My Actron Autoscanner CP9680 has been extremely helpful in determining this fault with recommended fixes being the following (ranked 1 as highest):
1) Replace PCM
2) Replace O2 sensor (Bank 2, Sensor 2)
3) Replace O2 sensor connector
4) Replace O2 sensor ground wire
Now I've done the following to try and fix the issue but my CEL keeps on turning back on. As I understand, Bank 2, Sensor 2 is the post-cat O2 sensor located on the driver's (right) side (RHD vehicle). The O2 sensors become slow to respond overtime and therefore activate the CEL as the heating element inside them no longer function (or a slow to heat up) - if this was true, the CEL will activate after approx. 35-40 secs from start up. My CEL, since the issue has always turned on within 5 secs of start up.
What I've replaced and tested:
Test: Disconnect Bank 2, Sensor 2 sensor connector to identify correct position (Check)
Replaced: Purchased genuine Mopar O2 sensor (NTK rebranded) as aftermarket equivalents such as Bosch do not work with the vehicle (slow to heat up).
After installation of the replacement O2 sensor and clearing the CEL, the vehicle was driven for 5mins (shopping) and the light did not activate. I started the vehicle after the shop (60mins) and drove home (5mins) and it also didn't activate. My next drive was 4 days later and this time the CEL activated 5secs after start up.
Now I don't think a new O2 sensor would fail and judging via visual inspection of the old one it was also in good condition (but I snipped the connector off to remove it!). I did some resistance/continuity checks using my multimeter to ensure they were in the specs and they were! my Autoscanner has the exact values which I'll dig up sometime.
Now I've also checked the wiring connectors from the PCM harness and they all seem to be in good condition - the vehicle hasn't been driven in the rain all of it's life nor has it been off road.
The only part I'm up to now is checking the ground wire which according to the FSM, uses a common grounding point labelled "G105" - all O2 sensors use this common ground. But the other 3 sensors have not triggered a fault (tested to by swapping them around), so my only assumption is that a possible grounding fault is before the 2/2 O2 sensor ground wire meets the central ground wire with the other 3 sensors.
I'm hoping that the PCM isn't the issue here as it could potentially be a very costly fix for such a low km vehicle.
I've been trying to chase the G105 grounding location and have yet to find it - the only ground wire I can see is a white strap in the centre of the engine on the firewall. Any help is much appreciated.
I've also read the following PDF for a similar issue on a Chrysler but still no luck unfortunately.
Tip:
When purchasing O2 sensors for the 3.7L and 4.0L engines, they use a common Mopar part number - 56029049AA these are rebranded NTK sensors (NTK is stamped on them), in Australia the same NTK part is under part number OZA571-C8 but is more expensive than the Mopar sensor from the dealership (AUD$137 vs AUD$155). The same NTK sensor can be purchased from Amazon in the US under part number 23159 for US$35 or approx. AUD$50.
For some reason I've been having an issue recently with my Nitro throwing a P0058 fault code with the description - "HO2S Heater Control Circuit High (Bank 2 Sensor 2)"
Now this has happened after running E10 fuel (10% ethanol, approx. 94 octane) since the car was new (now has 18000kms since 2008) and switching to 95 octane fuel (no ethanol).
My Actron Autoscanner CP9680 has been extremely helpful in determining this fault with recommended fixes being the following (ranked 1 as highest):
1) Replace PCM
2) Replace O2 sensor (Bank 2, Sensor 2)
3) Replace O2 sensor connector
4) Replace O2 sensor ground wire
Now I've done the following to try and fix the issue but my CEL keeps on turning back on. As I understand, Bank 2, Sensor 2 is the post-cat O2 sensor located on the driver's (right) side (RHD vehicle). The O2 sensors become slow to respond overtime and therefore activate the CEL as the heating element inside them no longer function (or a slow to heat up) - if this was true, the CEL will activate after approx. 35-40 secs from start up. My CEL, since the issue has always turned on within 5 secs of start up.
What I've replaced and tested:
Test: Disconnect Bank 2, Sensor 2 sensor connector to identify correct position (Check)
Replaced: Purchased genuine Mopar O2 sensor (NTK rebranded) as aftermarket equivalents such as Bosch do not work with the vehicle (slow to heat up).
After installation of the replacement O2 sensor and clearing the CEL, the vehicle was driven for 5mins (shopping) and the light did not activate. I started the vehicle after the shop (60mins) and drove home (5mins) and it also didn't activate. My next drive was 4 days later and this time the CEL activated 5secs after start up.
Now I don't think a new O2 sensor would fail and judging via visual inspection of the old one it was also in good condition (but I snipped the connector off to remove it!). I did some resistance/continuity checks using my multimeter to ensure they were in the specs and they were! my Autoscanner has the exact values which I'll dig up sometime.
Now I've also checked the wiring connectors from the PCM harness and they all seem to be in good condition - the vehicle hasn't been driven in the rain all of it's life nor has it been off road.
The only part I'm up to now is checking the ground wire which according to the FSM, uses a common grounding point labelled "G105" - all O2 sensors use this common ground. But the other 3 sensors have not triggered a fault (tested to by swapping them around), so my only assumption is that a possible grounding fault is before the 2/2 O2 sensor ground wire meets the central ground wire with the other 3 sensors.
I'm hoping that the PCM isn't the issue here as it could potentially be a very costly fix for such a low km vehicle.
I've been trying to chase the G105 grounding location and have yet to find it - the only ground wire I can see is a white strap in the centre of the engine on the firewall. Any help is much appreciated.
I've also read the following PDF for a similar issue on a Chrysler but still no luck unfortunately.
Tip:
When purchasing O2 sensors for the 3.7L and 4.0L engines, they use a common Mopar part number - 56029049AA these are rebranded NTK sensors (NTK is stamped on them), in Australia the same NTK part is under part number OZA571-C8 but is more expensive than the Mopar sensor from the dealership (AUD$137 vs AUD$155). The same NTK sensor can be purchased from Amazon in the US under part number 23159 for US$35 or approx. AUD$50.
