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Discussion Starter · #1 ·
I have had a P0135 code on my 2001 1st Gen for about two years now. This code signals a bad heater wire in the precat 02 sensor. I have replaced the sensor twice even using the overpriced factory sensor to no avail. It went off for a while but came back on. I am so tired of looking at the check engine light I thought about disabling it. What are your opinions of this move and how should I do it. Remove a bulb, cut a wire, fuse, ???? Never had any other problems with it.
 

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I would want the issue fixed so if there is another CEL situation you will know. By turning it off you won't have any idea another problem is there.

Clint
 

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Discussion Starter · #4 ·
I would want the issue fixed so if there is another CEL situation you will know. By turning it off you won't have any idea another problem is there.

Clint
Yeah I know but I a have a scanner so I could still check for codes if it starts acting up. So removing the bulb is what I figured was all that was needed. Anyone ever had a P0135 code on a 1st gen. I do not have cats so I thought this could have something to do with it but the sensor is before the cats.
 

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I have had a P0135 code on my 2001 1st Gen for about two years now. This code signals a bad heater wire in the precat 02 sensor. I have replaced the sensor twice even using the overpriced factory sensor to no avail. It went off for a while but came back on. I am so tired of looking at the check engine light I thought about disabling it. What are your opinions of this move and how should I do it. Remove a bulb, cut a wire, fuse, ???? Never had any other problems with it.
well first off go to pdftown.com and find your manual. it is there i just checked. this will tell you everything you need to know about what is potentially happening.

also, if its a signal/voltage issue, then its either and open or a short. you could start back probing the wires and or checking for continuity to see if there is an increase in resistance somewhere. from my readings i am to believe that the connections need to be sealed and kept absolutely clean as possible.

my 2004 manual that i have referenced for your problems state this. "check connection for short or open..."

your 2001 may be slightly different and may have you do that and possibly more like look for an exhaust leak or faulty fuel injection for example.

the above is by no means advice to check your fuel injectors. THE point of this post was to tell you if you are seriously interested in having the knowledge the dealer has, then download the manual for free.
 

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disable the SES light?

Why do we want to share how to do this? That can lead to selling of vehicles with a problem to unsuspecting buyers. Right, buyer beware. Really, though. Then we read threads from upset used Frontier buyers who only bad-mouth the vehicle.

I'm oK with the disabling if a seller discloses the fact to the potential buyer.

One really has to look at the dash cluster lights to ensure all appropriate lights illuminate when the key is turned to "ON." That would be the only clue a semi-educated buyer would check. Readily available code reader? Right.

Just an unsolicited opinion.
 

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The engine lights on these trucks are small bulbs that are not removable. They are wired onto a circuit board on the back of the cluster. If you cut the terminals you will not be able to put the bulb back on the board without soldering. Be careful when you disassemble the cluster to gain access to the bulb because you can easily knock the temp and fuel needles off and they are a PITA to get back on properly so they read right. Piece of cake, good luck. Make sure you check for codes periodically so you dont damage anything. And yes disclose the info if you sell the truck..........its the right thing to do
 

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Discussion Starter · #8 · (Edited)
well first off go to pdftown.com and find your manual. it is there i just checked. this will tell you everything you need to know about what is potentially happening.

also, if its a signal/voltage issue, then its either and open or a short. you could start back probing the wires and or checking for continuity to see if there is an increase in resistance somewhere. from my readings i am to believe that the connections need to be sealed and kept absolutely clean as possible.

my 2004 manual that i have referenced for your problems state this. "check connection for short or open..."

your 2001 may be slightly different and may have you do that and possibly more like look for an exhaust leak or faulty fuel injection for example.

the above is by no means advice to check your fuel injectors. THE point of this post was to tell you if you are seriously interested in having the knowledge the dealer has, then download the manual for free.
Thanks. Yeah I have a manual and am very knowledgeable about cars. I even stopped by the dealer and he gave me all the wiring diagrams and said it would be tough to follow the wire all the way to the ecu due to the large wiring harness. He said something in the ecu could be fried. He wasn't trying to make a sale either. I have tried everything from replacing the sensor twice to cleaning the factory harness and trying to trace the wires.

Why do we want to share how to do this? That can lead to selling of vehicles with a problem to unsuspecting buyers. Right, buyer beware. Really, though. Then we read threads from upset used Frontier buyers who only bad-mouth the vehicle.

I'm oK with the disabling if a seller discloses the fact to the potential buyer.

One really has to look at the dash cluster lights to ensure all appropriate lights illuminate when the key is turned to "ON." That would be the only clue a semi-educated buyer would check. Readily available code reader? Right.

Just an unsolicited opinion.
You know you can still trust some people. By the time I sell this truck no one will care if the CEL works.
 
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