2001 4 cyl code P1135

[markdunn99]

CEL on...code P1135..should be the upstream O2 sensor correct? I replaced it with a cheap model....didn't fix the problem..at least...the CEL didn't go out. Does it REALLY matter what model sensor you use? I've read a lot of posts about some aftermarket o2 sensors not working. So I've gone ahead and bought a Denso model....hopefully that will take care of it. Car is running perfectly fine though...very smooth. I have read some things about having to "reset the ECU" to make the CEL go out after replacing the part. How do you do that? Just remove battery power/ground? As an FYI for perhaps another time...where the heck is the connector located for the downstream o2 sensor? Do I have to remove the seats and carpeting to access it?

[BMR]

P1135 = Air/Fuel Sensor Heater Circuit Response. (Bank 1 Sensor 1)

http://www.obd-codes.com/trouble_codes/toyota/

Yes, that's the upstream sensor. But your Camry has A/F (Air/Fuel) sensors, not O2 sensors. The correct Denso p/n is 234-9010. Is that what you've purchased?

You wouldn't have to reset the ECU, it'll learn the new sensor. But if you want to, just pull the EFI fuse in the fusebox under the hood. Leave it out for a minute or so and then put it back. Removing the battery ground cable works too, but doing the EFI fuse doesn't cause the radio to lose its presets; lots easier too.

[markdunn99]

Thanks..yes I understand they call it an Air Fuel sensor on the Camry. Is it not the same function as an O2 sensor though? Damn! The one I just ordered is not that part number...but it is the one specified for the upstream sensor for my car. I got it from Rockauto...it was part number 234 4626. It certainly looks like the exact same part as what is in my car? But....I'll do some checking on the 9010 part number and see where I can get that. Thanks for your help.

Originally Posted by BMR

P1135 = Air/Fuel Sensor Heater Circuit Response. (Bank 1 Sensor 1)

http://www.obd-codes.com/trouble_codes/toyota/

Yes, that's the upstream sensor. But your Camry has A/F (Air/Fuel) sensors, not O2 sensors. The correct Denso p/n is 234-9010. Is that what you've purchased?

You wouldn't have to reset the ECU, it'll learn the new sensor. But if you want to, just pull the EFI fuse in the fusebox under the hood. Leave it out for a minute or so and then put it back. Removing the battery ground cable works too, but doing the EFI fuse doesn't cause the radio to lose its presets; lots easier too.

[BMR]

Originally Posted by markdunn99

Thanks..yes I understand they call it an Air Fuel sensor on the Camry. Is it not the same function as an O2 sensor though? Damn! The one I just ordered is not that part number...but it is the one specified for the upstream sensor for my car. I got it from Rockauto...it was part number 234 4626. It certainly looks like the exact same part as what is in my car? But....I'll do some checking on the 9010 part number and see where I can get that. Thanks for your help.

Ah... wait. 234-4626 is the correct sensor if you've got a non-California emissions equipped car. You can check it here in Denso's online catalog. The number I gave you is for CA cars; my bad. Which do you have?... look under the hood for a label that says which you've got, Fed or CA.

[markdunn99]

Holy crap! You're killin me! :-) Ummm...the sticker under the hood says it complies with US EPA and California regulations.... But...no worries...I've got both on order....I'll just return whichever one is not the right one.

Originally Posted by BMR

Ah... wait. 234-4626 is the correct sensor if you've got a non-California emissions equipped car. You can check it here in Denso's online catalog. The number I gave you is for CA cars; my bad. Which do you have?... look under the hood for a label that says which you've got, Fed or CA.

[fenixus]

if the sticker mentions California then the car complies with California emission specs. Federal versions mention only US & Canada (no word on California).

California sensors are more precise (and expensive) wideband Air Fuel Ratio sensor (4 wires) on the upstream. downstream uses same thimble type sensors as the federal counterparts.

make sure you are getting the actual Denso unit and not some wannabe mentioning Denso part number only as interchangable.

use only either NGK (NTK actually) or Denso, whichever you can find cheaper. amazon and ebay or rockauto may be some options.

[markdunn99]

Ok thanks. I can only say that the part was listed with that specific part number 234-9010 as a Denso air/fuel sensor specified for my car sooooo...can only assume it's the right part. We shall see once I get it in. I did get it on Amazon....not a bad price relatively speaking....I think it was $87 bucks and a $30 discount for signing up for their stupid credit card! :-) So even with 2 day shipping it only cost me a total of $67 bucks.

Originally Posted by fenixus

if the sticker mentions California then the car complies with California emission specs. Federal versions mention only US & Canada (no word on California).

California sensors are more precise (and expensive) wideband Air Fuel Ratio sensor (4 wires) on the upstream. downstream uses same thimble type sensors as the federal counterparts.

make sure you are getting the actual Denso unit and not some wannabe mentioning Denso part number only as interchangable.

use only either NGK (NTK actually) or Denso, whichever you can find cheaper. amazon and ebay or rockauto may be some options.

[Jason.MZW20]

2001s are all CA emissions (50 State Emissions).

O2 sensors and AFR sensors operate in a completely different manner. O2 sensors are narrowband, lambdas with a range of 0.1 V-1.0 V. They switch from lean to rich and rich to lean and the ECU averages that out to get the correct fuel mixture.

AFR sensors, on the other hand, output current based on the actual air-fuel ratio. Positive current is lean, negative current is rich (the exact opposite of an O2 sensor). The ECU also knows the exact AFR the engine is running.

[markdunn99]

Just an update...and to confirm...the Denso 234-9010 is the correct part. Just replaced it and the CEL is now out....all fixed. Thanks

Originally Posted by Jason.MZW20

2001s are all CA emissions (50 State Emissions).

O2 sensors and AFR sensors operate in a completely different manner. O2 sensors are narrowband, lambdas with a range of 0.1 V-1.0 V. They switch from lean to rich and rich to lean and the ECU averages that out to get the correct fuel mixture.

AFR sensors, on the other hand, output current based on the actual air-fuel ratio. Positive current is lean, negative current is rich (the exact opposite of an O2 sensor). The ECU also knows the exact AFR the engine is running.