2003 Toyota Avalon Check Engine Light still comes after rep

BOYTX21

MEMBER
2003 TOYOTA AVALON

Engine Performance problem
2003 Toyota Avalon 6 cyl Automatic 77000 miles

Hi
I get a big trouble with my Toyota Avalon XL 2003. One week ago, the Check Engine Light came on. I went to the Auto-zone store to read the error code. They gave me the code P0135 with the description of O2 Sensor bank 1 sensor 1. I bought a new O2 Sensor bank 1 sensor 1 of them about $216. Then I replaced it. The Check Engine Light turned off about one night. After that, the light comes on again. What should I do? I'm confusing with this problem.
thank a lot

3 Replies

ZACKMAN

MECHANIC
4,202 POSTS

P0135 refers to the O2 sensor heater circuit no activity, not necessarily the O2 sensor. The first thing I would check is the relay, located inside the engine room junction box JB.

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Tuesday, February 24th, 2009 AT 4:45 AM

BOYTX21

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The second mechanic replaced the O2 sensor and he said this is bank 1 sensor 1

I got big problem guy !

I gave 2 mechanics. The 1st mechanic said the oxygen sensor bank 1 sensor 1 for Toyota Avalon 2003 is in the back of the engine. The second mechanic said it's in the front ! I gave the 2nd mechanic, also the cheapest mechanic, he changed the O2 sensor in the front and the check engine light's still on ! He said I need to drive about 4 cycles to turn off the check engine light!

Please tell me which mechanic is right? I doubt the second mechanic :( I paid $100 to replace the front O2 sensor, it's so easy to unscrew ! I thought the O2 sensor bank 1 sensor 1 is under the engine, that's why I gave my car to auto shop.

Please tell me where exactly the oxygen sensor bank 1 sensor 1 for Toyota Avalon 2003 is?

I appreciate all of your help. Thanks a lot

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Friday, February 27th, 2009 AT 12:32 PM

ZACKMAN

MECHANIC
4,202 POSTS

Promise that you won't be mad at me. But the mechanic #1 was right. Bank 1 is the one closer to the fire wall. And mechanic #2 was totally wrong when he said you had to drive 4 cycles to turn the CEL off. It is only 2 trip cycles. He also overcharged you by a bunch. It only tool 0.8 hours of his hourly rate to replace that sensor. Unless his labor rate is 125 per hour.

Anyway, you just mis-spent your money. The original CEL codewas P0135 which means A/F Sensor (O2 sensor) heater circuit (Bank 1 Sensor 1). It has to do with the circuit, not the sensor itself. Here is the diagnostic for P0135