o2 sensor codes

[SilverHoghead]

Ok, the cat was giving me problems so I gutted it. It's a 99, so I'm aware of the o2 sensor problems. My buddy at an exhaust shop guided me through the whole process. I did the old anti-fouler trick and used two, with the top one drilled out and the bottom one let be... he did it on his dodge and it was all good. 50 miles in, i threw a code. I was thinking it was reading lean so I took one out and ran it with just one non fouler. I also reset the pcm by disconnecting the negative for the 30 minutes I was changing it. I threw a code at the end of the road. I'm wondering if it threw the code because it was reading rich, or if the code popped back up because it threw it the first time and didn't clear.

 

[Mopar1973Man]

(Shaking head)

I've gutted mine a long time ago I never even bothered the O2 sensors at all and didn't require any anti-foulers.

 

[Hotroder383]

Unplugging PCM will not "clear" the code, you need to go to big box parts store and borrow a code reader to clear it. It may be that the code has nothing to do with cat also.

 

[Mopar1973Man]

Unplugging PCM will not "clear" the code, you need to go to big box parts store and borrow a code reader to clear it. It may be that the code has nothing to do with cat also.

Correct... Video included...

Disconnecting Batteries to clear code on a Dodge Ram - YouTube

It throws code because the sensor is damaged and out of spec (too high or too low in voltage). Not because it's requiring anti-foulers...

 

[SilverHoghead]

Correct... Video included...

Disconnecting Batteries to clear code on a Dodge Ram - YouTube

It throws code because the sensor is damaged and out of spec (too high or too low in voltage). Not because it's requiring anti-foulers...

im throwing a po138

 

[Mopar1973Man]

im throwing a po138

Looked it up and its a wiring fault not a sensor. The sensor wiring is shorted to voltage.

P0138 1/2 O2 Sensor Shorted To Voltage Oxygen sensor input voltage maintained above normal operating range.