Metallic36
02-07-2009, 04:03 PM
Just wondering for those that have the GHL, if you had to use the non-fouler trick? My 2nd O2 sensor is throwing a code, and I'm wondering if that's why. It only has the one hi-flow cat.
Edit: Nevermind, found this:
DTC P0037 HO2S heater (rear) circuit low
DETECTION
CONDITION
• PCM monitors HO2S heater (rear) control signal at PCM terminal 93. If PCM turns HO2S heater (rear) off
but voltage at terminal 93 still remains low, PCM determines that HO2S heater (rear) circuit has
malfunction.
Diagnostic support note
• This is an intermittent monitor (O2 sensor heater).
• MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles.
• PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in PCM memory.
POSSIBLE
CAUSE
• HO2S (rear) malfunction
• Open circuit between ignition switch terminal C and HO2S (rear) terminal C
• Open circuit between HO2S (rear) terminal D and PCM terminal 93
• Short to ground circuit between HO2S (rear) terminal D and PCM terminal 93
• Poor connection at HO2S (rear) or PCM connector
• PCM malfunction
the non-fouler trick would work for the P0421 if the O2 sensor isn't that bad, but won't do anything for the heater circuit. since your also getting a P0037 (rear heater circuit) I'd say check your rear O2 wiring for shorts/grounds, if everything looks good i would replace the sensor.
Edit: Nevermind, found this:
DTC P0037 HO2S heater (rear) circuit low
DETECTION
CONDITION
• PCM monitors HO2S heater (rear) control signal at PCM terminal 93. If PCM turns HO2S heater (rear) off
but voltage at terminal 93 still remains low, PCM determines that HO2S heater (rear) circuit has
malfunction.
Diagnostic support note
• This is an intermittent monitor (O2 sensor heater).
• MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles.
• PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in PCM memory.
POSSIBLE
CAUSE
• HO2S (rear) malfunction
• Open circuit between ignition switch terminal C and HO2S (rear) terminal C
• Open circuit between HO2S (rear) terminal D and PCM terminal 93
• Short to ground circuit between HO2S (rear) terminal D and PCM terminal 93
• Poor connection at HO2S (rear) or PCM connector
• PCM malfunction
the non-fouler trick would work for the P0421 if the O2 sensor isn't that bad, but won't do anything for the heater circuit. since your also getting a P0037 (rear heater circuit) I'd say check your rear O2 wiring for shorts/grounds, if everything looks good i would replace the sensor.