Question about 2002 Toyota 4Runner

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My 02 toyota 4runner have code p1135

I don't know wha't part no i would neen for code plese help

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CODE P1135 AIR FUEL RATIO SENSOR HEATER OR CIRCUIT FAULT.THE AIR FUEL SENSOR AHEAD OF THE CATALYTIC CONVERTER.BASICALLY ITS THE UPSTREAM SENSOR LOCATED IN THE EXHAUST MANIFOLD.THIS IS THE PART YOU NEED IT LOOKS LIKE OXYGEN SENSOR .BUT ITS NOT.

Posted on Oct 18, 2009

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Trouble Code: P1135

A/F Sensor-11 (Bank 1 Sensor 1) Heater Circuit Malfunction
Possible Causes:


A/F sensor heater circuit or ground circuit is open A/F sensor heater power circuit is open A/F sensor heater is damaged or has failed PCM has failed

Replace Air flow sensor that is attached to air filter housing.

Posted on Oct 07, 2009

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Posted on Jan 02, 2017

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1 Answer

Code p1130 - p1135


Four digit codes are brand specific, in this case both codes mean the O2 sensor in front of the catalytic converter is malfunctioning. But it could also be a leaking injector or other fuel problem.

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I have a p1135 code does that mean it the o2 sensor cause i have change the mass air sensor


Code P1135 is a vehicle specific code for selected Toyota vehicles - it really helps to know what car you are working on...Year, Make, Model, Engine Size, Automatic or Manual Transmission, etc. There may be Technical Service Bulletins that apply to your vehicle that cover things like reprogramming the engine controller to correct this code, etc. Nobody can give you that information if they don't know what kind of vehicle we are talking about.

In general, the code description for code P1135 is "Air Fuel Ratio Sensor Circuit (California Emissions )"
The possible causes are
1. Open or shorted Air Fuel Ratio Sensor (AF) circuit
2. Faulty AF sensor
3 AF sensor heater or heater circuit shorted or open
4. Engine Control Module (ECM) Fault

The Mass Airflow Sensor (MAF) cannot cause this code - this is a "CIRCUIT" code, not a not a "LEAN" or "RICH" Oxygen Sensor (or AF Sensor) code. The MAF can only cause lean or rich codes.

Most of the time, this code is caused by the sensor itself, however, as I mentioned earlier, there are Technical Service Bulletins for several Toyotas that involve reprogramming of the Engine Computer.

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2002 toyota tacoma with a p1135 code and a # 4 cylinder misfire


I have had a problem like that on my Isuzu Rodeo Turns out the o2 sensor was bad. The computer reads it as not enough fuel. The mass airflow sensor will dump more fuel causing the engine miss fire.
You might check the codes again and see if you get the code for the 02 sensor. If so you can try to unplug the 02 sensor, the ck engine light will remain on, however the car should run without any issues.
Good Luck!!

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PER "http://www.obd-codes.com/trouble_codes/toyota/" P1135 =
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I have the same problem with my 04 Sequoia, I wish someone would answer this question.

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I got code P1135 in 01 toy 4runner. I have replaced the o2 bank 1 sensor (A/F sensor) and also the map sensor. On my scanner I read a 3.298 volts at all times! I even unplugged the sensor and it still...


P1135=Air-Fuel Sensor Heater Circuit Response Malfunction,
This code does not identify a particular o2 sensor,
did you get a code that showed a fault leading to the one you replaced?
Have you checked the voltage in the other o2 sensors to compare.

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Code p1135 what wrong help,toyota 2000,highlander


That code is specific to the Air-Fuel Ratio (A/F) Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

P1135 Trouble Area:
 Open or short in A/F sensor (bank 1, sensor 1)
 A/F sensor (bank 1, sensor 1) heater
 ECM __________________

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Toyota Specific Trouble Codes
P1135 Air/Fuel Sensor Heater Circuit Response. (Bank 1 Sensor 1)
If you have changed the proper sensor then you may need to have the cam shaft looked at.

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