2001 Camry p1135

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#1
Hello all,

I have a quick question for you. Our Camry with the large V-6, forgive me for not remembering the exact size, had the check engine light come on last night. I pulled the codes and got the p1135 referencing the A/F heater circuit. After searching on the web for a while I put the scanner back on the car to compare a few terms and the Short Term Fuel Trim Bank 1 Sensor 1 never leaves zero percent. The short term on bank 2 as well as both long term trim values are constantly changing. My quesiton is this, can we determine what the culprit is from this evaluation or do I need other terms? Thanks for all replies.

Josh
 

jjm

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#2
The V-6 is the 3.0L 1MZ-FE engine.

Most likely the O2 sensor (A/F sensor in Toyota speak) facing the firewall is bad, but check the relay in the relay block by the battery first for a hopefully easy and cheap fix. If the relay checks out, disconnect firewall side of the O2 sensor. Measure the resistance between the B+ (BLACK) and HT (BLACK/RED) terminal wiring on the SENSOR SIDE. Should be 0.8-1.4 ohms cold, 1.8-3.2 hot. Yours will probably read wide open, or infinity (indicating it's bad).

The sensor if bad isn't cheap... over $200 list from a Toyota dealer (only sensor you should buy).

Joe

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Thanks Joe,

As you suspected the sensor is bad, I had already purchased a Bosch universal O2 sensor and compared it's resistance to the good one on the front of the engine and they aren't even close. I will be returning my NAPA $70 part and getting one from the local toyota dealer for $225 tomorrow. I am having a hard time getting the original broke loose, any tricks for me other than good old fashioned grunting? Thanks again for the reply, I appreciate all the help.

Josh
 

2POINTautO

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Joe, I have noticed your diagnosis info a few times now on O2S's, do you keep this explaination in your own private database, are you copy and pasting it, I did that with AC work last season on a Word doc. The reason I am asking about your ON TARGET response is to see if you could add a small piece of info, if you feel it would be important. If the heater relay is also protected by a fuse or two. I know that on different years and models, these fuses may be in different locations so including an exact name or location in your response may not be feasable. Do you think making a reference to a fuse would also be an added benifit, or not. Thanks

Spray the sensor and exhaust with some type of break free and let it soak overnight or a good portion of the day.
 

jjm

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#5
The only reason I don't mention things like fuses - or wiring for that matter - is because I have yet to see this failure mode for those codes, so I only post what I believe the likely failure points would be.

Granted, I rarely see the relay fail, but it's such a quick, easy, and cheap fix than can be done while dressed in a tuxedo, and that's why I mention it.

The way I see it, if the sensor - the most likely failure - and relay checks out good, posters can post back and we can take them to fuses and wiring. I just can see posting each and every possible troubleshooting point initially... which could end-up confusing posters where they'd just throw their hands up.

Joe

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