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Replacing the 1,1 oxygen sensor

Diagnostic code states PO134 and PO135

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P0134 means that no activitiy (function) is detected in the sensor. P0135 is an 02 sensor heater malfunction. Basically, it sounds as if your O2 sensor is dead and needs replacement. Being that you state it's the 1,1 sensor, you're talking about the primary, or pre-catalyst, oxygen sensor. This is the one closest to the engine, before the catalytic converter.

Posted on Jul 27, 2008


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Got Honda accord 2000 code po135 replaced 02 sensor and stil show same code

How to Diagnose a P0135 -Heater
Performance Bank 1 Sensor 1 (GM 3.5L)
January 31, 2012 Updated: October 29, 2014 Written by: Abraham Torres-Arredondo Article Id: 371

image_1.gifIf your check engine light is on and you have a diagnostic trouble code P0135 stored in the PCM's memory... then you've come to the right place to test and troubleshoot the upstream oxygen sensor.
A P0135 DTC says: HO2S Heater Performance Bank 1 Sensor 1... and this means that the PCM (Powertrain Control Module = Fuel Injection Computer) has detected a problem with the front oxygen sensor's heater element or a problem in the heater's circuit (wires).
In this tutorial, I'll show you how to check the oxygen (O2) sensor's heater element and the two circuits that feed it with power (10 to 12 Volts) and ground with a multimeter.
In case you're wondering, where the oxygen (O2) sensor that the code P0135 is accusing of being BAD is... this bad boy is located on the exhaust manifold and before the catalytic converter.
To help you navigate this article, here are its main points:
  1. Symptoms of a BAD Oxygen Sensor Heater Element.
  2. What Tools Do I Need to Test Code P0135?
  3. What Does the Heater Inside the Oxygen Sensor Do?
  4. Circuit Descriptions of the Downstream Oxygen Sensor.
  5. Start Here.
  6. TEST 1: Oxygen Sensor Bank 1 Sensor 1 Test.
  7. TEST 2: Checking 12 Volts to O2 Heater.
  8. TEST 3: Checking the O2 Heater's Ground Circuit.
  9. TEST 4: Ohming the O2 Heater Element.
  10. P0135 O2 Sensor Heater Test Summary.
Buying a Digital Multimeter for Automotive Diagnostic Testing (found at:
  • Scan Tool.
    1. Don't have one?... check out my recommendation: Abe's Scan Tool Recommendation.
  • Wire Piercing Probe.
    1. Although this tool is not an absolute must, if you do buy one, you'll realize just how easy it makes testing the voltages inside the wires.
    2. If you need to see what this tool looks like, you can see it here:Wire Piercing Probe.
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  • Applies To:
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    Buick Vehicles:
    • Rainier 4.2L
      • 2004, 2005
    Chevrolet Vehicles:
    • Colorado 3.5L
      • 2004, 2005
    • Trailblazer
      • 2004, 2005
    3.5L image_thumb_home_page_1.jpg
    How To Test for a Blown Head Gasket (GM 3.5L, 4.2L)
    How to Test the MAF Sensor and Codes: P0100, P0101, P0102, P0103
    How To Test for a Blown Head Gasket (GM 3.5L -FWD)
    All Articles: 3.5L "A day without sunshine is like, you know, night"
    Steve Martin

    Feb 03, 2015 | 2000 Honda Accord

    1 Answer

    1998 isuzu redeo codes

    This code means that the Oxygen sensor shows no activity. Check for exhaust leaks and intake air leaks test fuel pressure check fuel filter (plugged) all ok replace sensor oh bank 1 sensor 1

    Apr 07, 2014 | Isuzu Rodeo Cars & Trucks

    1 Answer

    Code reading po135 2002 jeep

    PO135 is oxygen sensor heater failure bank 1 sensor 1, most likely if no wiring damage is seen it is the oxygen sensor itself. (forward most oxygen sensor on #1 cylinder side)

    Apr 04, 2013 | Jeep Grand Cherokee Cars & Trucks

    1 Answer

    Code PO134

    Trouble Code: P0134

    HO2S-11 (Bank 1 Sensor 1) Insufficient Activity

    Possible Causes:

    HO2S heater is damaged or has failedHO2S signal or ground circuit has a high resistance conditionHO2S signal circuit is open or shorted to system power (B+)HO2S has failed (i.e., it is silicon, water or fuel contaminated)PCM has failed.Sounds like you need a new oxygen sensor,Bank 1 Sensor 1 is located on the exhaust manifold, closest to the front.Here's a link to the firing order,bank one is cylinder one side.Here's the part you need,here's how to replace.

    Feb 15, 2013 | 2002 Pontiac Grand Prix

    1 Answer

    2003 dodge caravan V6 error code po135

    PO135--- Oxygen Sensor Heater Circuit Malfunction
    (Bank 1 Sensor 1)

    Oct 06, 2012 | 1999 Pontiac Grand Am GT

    2 Answers

    Multiple erroneous diagnostic code readings.

    Contact a Mitsubishi dealer for advise , could need a new ecu , hard to say without seeing vehicle

    Jun 05, 2017 | 2002 Mitsubishi Eclipse Spyder

    1 Answer

    P134, p0141, po300, po130 and po135. 2005 Sunfire.

    Given that most of the trouble codes are for the O2 sensor, I think I would change it. The multiple misfires could be because of improper fuel/air mixture caused by a bad sensor. Disconnect the negative(-) battery terminal then change the sensor. Disconnecting the negative(-) should reset the computer and allow the fuel/air mixture to return to default allowing the engine to start.
    P0130 - O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
    P0134 - O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
    P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
    P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
    P0300 - Random/Multiple Cylinder Misfire Detected

    Jun 16, 2010 | 2005 Pontiac Sunfire

    2 Answers

    Po134 trouble code

    This code refers to the front oxygen sensor on Bank 1. Basically the oxygen sensor is inactive. Here's why:
    The powertrain control module (PCM) provides a baseline voltage of about 450 mV on the oxygen sensor signal circuit. When cold, the PCM detects the the internal resistance of the sensor is high. As the sensor warms up the resistance is lowered and it starts producing voltage based on the oxygen content in the exhaust. When the PCM determines that the time it took for the sensor to warm up is greater than one minute or that the voltage is inactive (not reading outside 391-491 mV it views the sensor as inactive or open and sets the P0134 code.Potential Symptoms
    One or more of the following may occur:
    • Check engine light illumination
    • Poorly running/engine missing
    • Blowing black smoke
    • Poor fuel economy
    • Dying, stuttering
    Causes A code P0134 may mean that one or more of the following has happened:
    • Bad O2 (oxygen) sensor
    • Bad heater circuit in the O2 sensor
    • Wiring or connector to the sensor frayed / broken
    • Blown heater circuit fuse
    • Holes in the exhaust system
    • PCM failure
    Possible Solutions The most common fix is to replace the oxygen sensor. But that doesn't rule out the possibility of:
    • Rusted exhaust pipe
    • Inspect wiring & connector(s) for problems
    • Excessive amperage blowing heater fuse (still requires replacement of sensor but also replacement of blown fuse)
    • Replace PCM (only as last resort after all other possibilities are covered.

    Dec 10, 2009 | 1999 GMC Yukon

    1 Answer

    PO130,PO134,PO135 Codes came up for my 2003 Chevy Cavalier

    it is the oxygen sensor on the exhaust manifold, the closest one to the motor

    Aug 26, 2009 | 2002 Chevrolet Cavalier Coupe

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