Question about 2003 Hummer H2

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2003 Hummer H2 Oxygen Sensor P0135 error won't go away

I have a 2003 Hummer H2 w/ 6.0 vortec engine. I had a check engine light come on and read the cod of P0135. So I replaced the 4 02 sensors and reset the system. code came back. Checked the 02 heater fuses and they are both good. What could be wrong?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: i have a hummer h2 2003 whith a p0135

What you have to do is replace the o2 sensor on bank 1 sensor 1.This is the front sensor on the left side on the exhaust system.Left side is bank 1 and right side is bank 2.Make sure the connections are good first.Usually it`s the internal heater in the o2 sensor.Hope this helps.Good luck.

Posted on Dec 12, 2009

  • 218 Answers

SOURCE: 2003 Hummer H2 overheats while idling in Park

NED TO HAVE THE CODES FOT THE CHECK ENGINE LIGHT READ.THE CODE WIL LEAD U IN THE CORRECT DIRECTION.GET BACK TO ME W/THE CODE.

Posted on May 13, 2009

SOURCE: my 2003 h2 hummer will initally not shift from

Check the linkage that goes from the shift lever down to the transmission. It sounds like somewhere along the line, it has become disconnected or has broken.
if that parts are clean then It sounds like you have a shift control solenoid that has high resistance causing the hard shift you describe. Scan the PCM for trouble codes if none are present you could have a internal transmission problem.

Posted on Jul 17, 2009

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SOURCE: i have a p0135 diagnostics code on my hummer h2 and

Left side (number 1 cylinder) in the exh pipe.(Number 1 sensor) Number 2 sensor is AFTER the Cat Converter.

Posted on Dec 30, 2009

Testimonial: "thanks alot man. i kinda figured it out when i went underneath."

bluebirdmate
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SOURCE: hey i have a hummer

Hello: Bank 1 tells you it is the side of the engine that has #1 cylinder (Which on your truck is the drivers side) SENSOR 1 IS THE SENSOR FOR THAT BANK IN FRONT OF THE CATALYTIC CONVERTER. This code tells us the heater in the sensor has a problem. You should replace the sensor. (Experience: I highly recommend a GM part. The GM engine control module is very sensitive to 02 sensors). Make sure the truck end of the harness connector is clean and not damaged. After replacing sensor you will have to have the code cleared. (auto Zone, Advance Auto may can do it and not charge you.

Posted on Jan 08, 2011

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1 Answer

I have the check engine light on and the scan read P0135 error - what is this?


P0135 code is: Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

This code refers to the front oxygen sensor on Bank 1.

The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135.

Symptoms: You will likely notice poor fuel economy the illumination of the MIL.

Causes: A code P0135 may mean that one or more of the following has happened: O2 Heater element resistance is high Internal short or open in the heater element O2 heater circuit wiring high resistance open or short to ground in the wiring harness.

Possible Solutions: Repair short or open or high resistance in wiring harness or harness connectors Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)

Dec 29, 2015 | 2006 Ford Focus ZX3

1 Answer

Reset the engine immobilizer on a 2003 hummer h2 the engine turns over but will not start


Have you had the crankcase temp sensor checked. If this sensor fails the motor will not start. Hope this is of help.
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Jan 03, 2015 | 2003 Hummer H2

1 Answer

I have a 2006 Hummer H2 and I got a check Eng. light and I checked the code it says P0054,,,HEATER RESISTANCE BANK1 SENSOR 2. ANY IDEAS?????


probly a bad oxygen sensor--some are xpensiv--it real important cause it regulates lean or rich for fuel injectors--too lean can damage valves--usually when theres a heater issue on a sensor-it needs new--a factory scan at a private shop will show details on engine--cheap code readers dont doit

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1 Answer

2003 Hummer H2 - Check Engine Light- P0171 and also been leaking/losing coolant a lot lately! Could the two issues be related or separate problems?


Fuel system too lean (too much air, not enough fuel) vacuum leaks being the most common, you might want to check for a bad airflow sensor, plugged fuel filter, clogged fuel injectors, low fuel pressure, exhaust leaks, a bad PCV valve, bad oxygen sensor, stuck open purge valve. mass air flow (MAF) sensor are fairly common too. Sometimes the mass air flow sensor just gets dirty and gives false air flow readings.

Dec 09, 2013 | Cars & Trucks

2 Answers

Hey i have a hummer h2 2004 and i have the check engine ligh on the code is p0135 (bank 1, sensor1) what sensor is it? thanks


Hello: Bank 1 tells you it is the side of the engine that has #1 cylinder (Which on your truck is the drivers side) SENSOR 1 IS THE SENSOR FOR THAT BANK IN FRONT OF THE CATALYTIC CONVERTER. This code tells us the heater in the sensor has a problem. You should replace the sensor. (Experience: I highly recommend a GM part. The GM engine control module is very sensitive to 02 sensors). Make sure the truck end of the harness connector is clean and not damaged. After replacing sensor you will have to have the code cleared. (auto Zone, Advance Auto may can do it and not charge you.

Jan 08, 2011 | 2003 Hummer H2

1 Answer

2003 Dodge Stratus Sxt 2.4L, 5-speed manual 85000 miles My check engine light is on and I failed inspection, which returned a P0135 code. We replaced the upstream O2 sensor, but I haven'r put enough...


The oxygen sensors have four wires. Two are for the power circuit for the heater within the oxygen sensor, they only work when hot and can not wait for the exhaust to get warmed up. The other two wires are for the oxygen sensor circuit. Your error code p0135 indicated that the heater power circuit was open. This was either due to a faulty heater element within the sensor or there was a break in the circuit due to dirt in the connector or a fractured wire. Your code P0303 is quite separate and is due to misfire on cylinder 3 (the last digit). Check the spark plug, the coil on plug socket for any shorting.

Dec 30, 2010 | 2003 Dodge Stratus

1 Answer

My 2003 Kia Optima check engine light keeps coming on. I was told "Bank 1 Sensor 1" needs to be replaced. Where is Bank 1 Sensor 1?


P0130 Oxygen Sensor Circuit Malfunction - Bank 1 Sensor 1.
P0131 Oxygen Sensor Circuit Low Voltage - Bank 1 Sensor 1.
P0132 Oxygen Sensor Circuit High Voltage - Bank 1 Sensor 1.
P0133 Oxygen Sensor Circuit Slow Response - Bank 1 Sensor 1.
P0134 Oxygen Sensor Circuit No Activity detected - Bank 1 Sensor 1.
P0135 Oxygen Sensor Heater Circuit Malfunction - Bank 1 Sensor 1


Jun 23, 2010 | 2003 Kia Optima

1 Answer

I have a hummer h2 2003 whith a p0135 heater mal funtion bank 1 sensor 1


What you have to do is replace the o2 sensor on bank 1 sensor 1.This is the front sensor on the left side on the exhaust system.Left side is bank 1 and right side is bank 2.Make sure the connections are good first.Usually it`s the internal heater in the o2 sensor.Hope this helps.Good luck.

Dec 12, 2009 | 2003 Hummer H2

1 Answer

2003 Hummer H2 overheats while idling in Park


NED TO HAVE THE CODES FOT THE CHECK ENGINE LIGHT READ.THE CODE WIL LEAD U IN THE CORRECT DIRECTION.GET BACK TO ME W/THE CODE.

May 13, 2009 | 2003 Hummer H2

1 Answer

Abs Light On


if you could plugg in with a scan tool it would tell you where to look.
i find many times that its just a wheel sensor wire .
so that is where i would start to look

Jan 02, 2009 | 2003 Hummer H2

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