o2 sensor heater fuse keeps blowing
08-19-2017, 09:18 PM
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Model: Cherokee
o2 sensor heater fuse keeps blowing
Jeep started running like crap, missing the other day soon did a tune up, cap,rotor and new plugs. Thought I fixed it but the CEL came on for p0138 and p0135. Fuse is blown under hood,blows instantly when replaced. Damn fuse blows even when both o2 sensors are unplugged,im guessing wiring issue.
Wiring looks good, connectors too,took the loom off the wires and nothing is burnt.Any tips or advice? Drivability is fine but I'm gonna get boned when inspection is due in a few months lol.
Wiring looks good, connectors too,took the loom off the wires and nothing is burnt.Any tips or advice? Drivability is fine but I'm gonna get boned when inspection is due in a few months lol.
08-20-2017, 08:48 AM
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09-12-2017, 06:04 PM
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Bump anyone have any ideas? Check engine light is on but the truck doesnt skip a beat ,lol. I followed the wiring up from the front one and it goes into that plastic rail and all looks well,no bare spots that i can see.
11-28-2018, 06:22 AM
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11-28-2018, 07:13 AM
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Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
For my o2 on the Comanche the front upper control arm ripped the wires out and it shorted. In my Cherokee I've had a stick rip it off, something made it fall on the exhaust, and another time I came down on a rock landing on the exhaust and that shoved the o2 sensor up into the floor shorting it out. So in my experience the wiring probably got messed up somewhere somehow and you just need to take a look under the jeep and see if you can find any damage to the wiring.
12-19-2018, 12:01 PM
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Well I’ve been digging around and there is a small section at the front o2 sensor wiring where the outer wrap has rubbed off from the front drive shaft, but the wiring inside all looks fine, no copper showing. Another thing to point out, when I replace the fuse it doesn’t blow right away. This last time lasted about a week then blew a fuse again. I’m at a loss
12-19-2018, 05:15 PM
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Year: 1999
Model: Cherokee(XJ)
Engine: 4.0
Originally Posted by Fleags
Well I’ve been digging around and there is a small section at the front o2 sensor wiring where the outer wrap has rubbed off from the front drive shaft, but the wiring inside all looks fine, no copper showing. Another thing to point out, when I replace the fuse it doesn’t blow right away. This last time lasted about a week then blew a fuse again. I’m at a loss
12-19-2018, 05:41 PM
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Model: Cherokee (XJ)