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Old 10-21-2008, 08:17 PM #1
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Check engine light on. OBDII code P1135.

I have a 2002 4Runner sport edition with the engine light on. My OBDII code reader picked up code P1135. (Air-Fuel Sensor Heater Circuit Response Malfunction). Is this an easy fix or would I need to bring this in for servicing. If someone knows where this sensor is located please reply and assist me. Thank you.
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Old 10-21-2008, 11:12 PM #2
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its more commonly known as the oxygen sensor, and is found in the exhaust.
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Old 10-21-2008, 11:48 PM #3
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It's Air Fuel ratio sensor. It costs about two hundred dollars at the dealer. You should make sure you give your dealer your car's VIN to match the correct part. You can also get it online from Denso. It's cheaper, but I'm not sure how much cheaper when including shipping cost. I recently changed it on my 02 tacoma. For my tacoma, there were two sensors, one after the first cat converter and the other one after the second cat converter. I had to change the one after the first cat converter.
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Old 10-22-2008, 02:30 AM #4
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yes the newer 4runners use the A/F sensors and they are a bit more expensive. More than likely the one before the cat. That's the one that usually throws codes. You can also get them online from URD.
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Old 10-22-2008, 04:55 PM #5
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http://cgi.ebay.com/ebaymotors/GENUI...mZ270272808940


Its cheaper and exactly what you need. I had the same problem about 4 months back and this fixed it. Its oem too.
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Old 10-26-2008, 03:15 PM #6
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I had this same code (2002 - 91300 miles). Both AutoZone and Advance Auto Parts will read the code free. Once I removed the old A/ F sensor, I used an ohmn meter touching both black wires. The meter didn't move - the circit was open. I purchased an A/F Ratio sensor commonly called an O2 sensor at www.sparkplugs.com
1 - Denso AIR/FUEL SENSOR
Stock Number: 234-9002
Part Number: 234-9002
Unit Price: $153.59 +shipping

but found one cheaper at amazon.com . I've seen that a denso brand was the best . The new A/F sensor had resistence .... To reset the 4Runner's computer I just disconnected the negative side of the battery for a few minutes ....... Reconnected it and then started the engine .. No more light.
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Last edited by CitadelBlue; 11-05-2008 at 10:10 PM.
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Old 11-05-2008, 09:37 PM #7
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check also the ground wire on the manifold. Mine was loose and was sending this code.
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Old 06-27-2017, 05:11 PM #8
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P1135 code on a 2001 4Runner SR5

I have a 2001 4Runner SR5. The P1135 code was read from my OBD2 meter. From this forum I found it to be the air/fuel ratio sensor. But others are calling it an O2 sensor, which they are saying is another name.

I looked up the replacement part from Denso's website. They are different parts. I am hoping I'm not going to have to eat a $100 A/F part.

The A/F sensor replacement is 934-9002

And there are two O2 sensor replacement parts, each with their own respective part number.

So, which is it? Is it the Air-Fuel Sensor or O2 sensor(s) that go with OBD P1135?
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Old 06-27-2017, 05:36 PM #9
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Quote:
Originally Posted by AllanR View Post
I have a 2001 4Runner SR5. The P1135 code was read from my OBD2 meter. From this forum I found it to be the air/fuel ratio sensor. But others are calling it an O2 sensor, which they are saying is another name.

I looked up the replacement part from Denso's website. They are different parts. I am hoping I'm not going to have to eat a $100 A/F part.

The A/F sensor replacement is 934-9002

And there are two O2 sensor replacement parts, each with their own respective part number.

So, which is it? Is it the Air-Fuel Sensor or O2 sensor(s) that go with OBD P1135?
1. No doubt on a P1135 on a 2001. It's your Front A/F sensor

2. Part number is 234-9002, not 934-9002. This one:

https://smile.amazon.com/Denso-234-9...234-9002+denso
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Old 06-27-2017, 06:16 PM #10
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Quote:
Originally Posted by AllanR View Post
They are different parts....

So, which is it? Is it the Air-Fuel Sensor or O2 sensor(s) that go with OBD P1135?

1) @TheDurk is correct, it's and Air/Fuel Sensor for code p1135. I believe 02 sensors are still considered "generic" and therefore would have a P0135 for an 02 heater circuit. (The 1 right after P in the code designates a manufacturer specific code, while a 0 means a generic OBD code, same for all vehicles across the board, post 1996)

2) if you ever have doubts, you can always check your smog label on your hood. It will say something at the bottom like "EVAP, SFI, AFS, H02S" as those are the types of emission devices it has. If it says "AFS" that's obviously A/F sensor. If it has 2 02's instead, it will say "H02S(2)".

Of course you need to have the hood that came with your truck, as a lot of guys change them out.

Hope this helps somebody
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Old 06-28-2017, 03:11 PM #11
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Quote:
Originally Posted by 4Reak Show View Post
1) @TheDurk is correct, it's and Air/Fuel Sensor for code p1135. I believe 02 sensors are still considered "generic" and therefore would have a P0135 for an 02 heater circuit. (The 1 right after P in the code designates a manufacturer specific code, while a 0 means a generic OBD code, same for all vehicles across the board, post 1996)

2) if you ever have doubts, you can always check your smog label on your hood. It will say something at the bottom like "EVAP, SFI, AFS, H02S" as those are the types of emission devices it has. If it says "AFS" that's obviously A/F sensor. If it has 2 02's instead, it will say "H02S(2)".

Of course you need to have the hood that came with your truck, as a lot of guys change them out.

Hope this helps somebody
In his case, being a 2001, there is no confusion. Bank 1 Sensor 1 is an A/F sensor on all 4Runners. But you are correct: P1135 is A/F only.
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Old 06-28-2017, 08:34 PM #12
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Quote:
Originally Posted by Stick Figure View Post
its more commonly known as the oxygen sensor, and is found in the exhaust.
NO IT'S NOT. There are two different sensors that Toyota used, depending upon year and emissions package. It is important not to confuse the two different sensors.


Look around carefully online, you can get this sensor for about $150 shipped.
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