Running rich? O2 sensor heater and high voltage codes
#1
Running rich? O2 sensor heater and high voltage codes
Just put a new exhaust on my 01 5.9 and started to run rich. Replaced o2 sensors because I thought they were bad but didn’t help. Has been throwing high voltage and heater circuit codes for the o2 sensors. Any ideas? Are these two connected?
#3
yea the codes were thrown before. That’s why I thought the sensors were bad. Also it’s federal emissions
#6
More questions : The problems started after putting the exhaust on ? What kind of exhaust, catback or everything including cat ? Or in other words, did you touch the O2 sensors ?
IIRC federal has one O2 before the cat and one after, and no mini-cat in the downpipes. There is a chance to reverse the O2 connections, so the PCM reads the after cat O2 as before cat and vice versa. That causes the PCM to read lean and add fuel. Could also be that one of the connections is just bad and it runs default tables.
IIRC federal has one O2 before the cat and one after, and no mini-cat in the downpipes. There is a chance to reverse the O2 connections, so the PCM reads the after cat O2 as before cat and vice versa. That causes the PCM to read lean and add fuel. Could also be that one of the connections is just bad and it runs default tables.
#7
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#8
In that case have a really close look at all the wiring. There are four wires in the O2 connectors. From the harness side: dark green/white is 12V for the heaters, brown/white is the heater control from the PCM, black/light blue is the sensor ground (common between both sensors). Tan/white is the upstream sensor, orange/black is the downstream sensor.
#10
In that case have a really close look at all the wiring. There are four wires in the O2 connectors. From the harness side: dark green/white is 12V for the heaters, brown/white is the heater control from the PCM, black/light blue is the sensor ground (common between both sensors). Tan/white is the upstream sensor, orange/black is the downstream sensor.