Norcal Mechanics

[Husafan]

As a new Comanche owner in San Jose, CA, I was just wondering if any other owners in the area had mechanics they trusted and could recommend?

 

Thanks!

[Akula69]

um, there are a few folks on the forum who know a little about MJ's....whats wrong with it?

[Husafan]

The check engine light is on with P0132 and P0135 codes. The engine runs fine. Looking at other forums, I have seen suggestions to change the front bank O2 fuse and the O2 sensor itself if the fuse doesn't work.

 

That being said, the guy I picked it up from thought it might have to do with a missing vacuum component that was left off when the 99 cherokee engine was put into my 87 Comanche. So my thinking was: I will try replacing the fuse and then the sensor, but if that doesn't work, take it to a shop. Because CA law requires that I get it registered within 10 business days of purchasing it, and because I don't think I can get it registered with the check engine light on, I don't have too long to work on it myself.

[Husafan]

By the by - should I move this over to MJ Tech then?

[Harley]

can't ya get a 30 day permit like ya can get here in NV?

[Husafan]

I hadn't even looked into that. I'll check.

[fiatslug87]

Or register it as non-operational until you can get it resolved.

[Akula69]

SYMPTOM

P-0132 1/1 O2 SENSOR SHORTED TO VOLTAGE

 

WHEN MONITORED

With the engine running for more than 2 minutes and coolant temperature above 170 degrees F .

 

SET CONDITION

The oxygen sensor voltage is above 1.2 volts .

 

POSSIBLE CAUSES

• O2 sensor 1/1 wiring harness intermittent defect
  
• O2 sensor 1/1 wiring harness observable defect
  
• Signal circuit shorted to voltage (at PCM)
  
• Signal circuit shorted to voltage (wiring harness)
  
• O2 sensor 1/1 connector terminal(s) observable defect
  
• O2 sensor defective 1/1
  
• PCM connector terminal(s) observable defect
  
• PCM defect (1/1 O2 sensor)
   
  

 

 

SYMPTOM

P-0135 1/1 O2 SENSOR HEATER FAILURE

 

WHEN MONITORED

With the engine at idle immediately after a cold start (engine < 147 degrees F and battery temp ±27 degrees F of engine temperature).

 

SET CONDITION

O2 sensor voltage > 3V for 30 to 90 seconds

 

POSSIBLE CAUSES

• 1/1 O2 sensor connector damaged
  
• 1/1 O2 sensor ground circuit open
  
• ASD relay output circuit open
  
• 1/1 O2 sensor failure
  
• 1/1 O2 sensor heater element failure
  
• 1/1 O2S heater failure does not reoccur
   
  

Hmmm. I'd say the first O2 sensor was bad. $8.00 at Rockauto.

[Husafan]

Thanks for the detailed reply!!

 

I actually tried replacing some fuses first, and the light has stayed off, at least for the drive home. Update here: http://comancheclub.com/topic/36561-my-mj-yt-yts-her-name/

 

Should it come back on, I will definitely try the O2 sensor.

[Husafan]

Well, looks like the light came back on this morning on the way to work. Time to change out the O2 sensor. :)