Cel P0135

[sandman81]

got a CEL on my 96 avalon so i took it to autozone to get the code extracted. they told me P0131 bank1 sensor1. got on line and found out that B1 S1 is the O2 senor by the firewall. i bought the cheaper of the 2 bosch sensors the universal one because thats all autozone had. installed it. cleared the CEL by disconecting the battery and about 50miles later it is now back on. what do you guys reccomend i do now?

[toyomoho]

Have the code read to determine if it is the same one.

The P0135 code is stating the heater in the sensor is drawing too much or too little electrical current. This is a heated 02 sensor, it has a little electric heater inside plus the actual 02 sensor.

Did the new sensor have the same number of wires as the old, did it plug into the existing wiring?

Use an ohmmeter to compare the new sensor heater circuit resistance, should be something like 11-19 ohms.

Some owners have trouble with Bosch in Toyota and better luck with Denso.

[sandman81]

it has all 4 wires. and my next plan was to check the wires. i have read that some have had trouble with bosch. i wish i knew before i purchased it. do you know why bosch isnt good?

[toyomoho]

Have no idea, just going on past posts, etc. Unfortunately more then one person has had issues with Bosch when used in Toyota.

For the Gen 4 Camry the code trips if the heater current exceeds 2.35 amps or is less then 0.2 amps. 2 trip detection.

Heater resistance should be between 11-16 ohms at 68F. 23-32 ohms with engine running and sensor hot.

[modian]

I just solved my P0135 problem recently. I replaced the original O2 sensors with about 168K miles on them. Rather than pay $160 each from the dealer (needed 3) I bought some from eBay. I paid a shop to install my parts because I wasn't fond on replacing the 1/1 (or 1/2) sensor. 2/1 was a cinch! The fronts tuned out to be some cheap-o units, the rear was a Walker brand. After they were installed the P0135 came back, and a P0141 (rear heater failure) - crap!

I ran the car up on ramps and measured the ohms on each sensors. It turns out the rear sensor wasn't even plugged in. There's my P0141 code. It measured 15.5 ohms - good. 1/1 measured 5.9 ohms, and 2/1 measured 6.2 ohms. And what a pain it was to get to the 1/1 sensor! The 1/2 sensor is no joy either because the access hole is so small.

My servicing dealer told me the P0135 code was from the 1/1 (cheap, non-OEM) sensor and it needed replacement. Instead of buying their Denso supplied sensor at $160 and $200 to install it I took my car home. I bought a Denso sensor (from eBay for $68 total). It measured 12.9 ohms. I ended up paying $110 to have it installed. Why, oh why couldn't 1/1 be the one near the radiator? Problem solved.

Moral of the story? Use Denso parts. Do the repair once.

[sandman81]

thanks for the advice guys. autozone returned my bosch unit and i replaced it with denso and the CEL went away. bosch can suck my balls.