Question about 1998 Toyota Avalon

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1998 Avalon Oxegen Sensor

The O2 sensor is out, the test shows "O2 sensor Heater Circuit Malf (Bank 1 Sensor 1)"

My question is where is this particular sensor, I changed the one in the fornt center of the motor but that was not the correct one.



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Bank 1 Sensor 1 is the sensor next to the head and in front of the cat converter for the head nearest the firewall. Not after the cat.

See the diagram on page one of:

Posted on Jul 31, 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

    Codes P0325 codes P0141

    PO141 is an O2 Sensor Ckt Malf in (Bank 1 Sensor 2)
    PO325 is a Knock Sensor 1 Ckt Malf in Bank 1 or Sensor 1

    You're problem is in Bank One, more than likely an O2 sensor...I'd go to AutoZone or your parts store and ask for a print out on these codes.

    Aug 14, 2011 | 1996 Mercury Villager

    2 Answers

    Check engine sign appeared on my 2001 avalon , code error p1155, please advise

    Appears it is an Oxygen sensor error, they are located in the exhaust system, in the v6, that code indicates the second bank (but unsure which bank that is) Ideally you need to take the car in for service, or at least inspect the Oxygen sensors, the code indicates that teh heater element has failed.

    May 06, 2011 | 2001 Toyota Avalon

    1 Answer

    2005 dodge grand caravan 3.8 code P0135 I bought the oxegen senser but Iam wondering if it could be the egr valve needs to be cleaned. what do ya think

    P0135 = O2 sensor heater circuit malfunction (bank 1, sensor 1)

    With no other symptoms other than the above code, I would think it was the O2 sensor.

    Mar 07, 2011 | Dodge Grand Caravan Cars & Trucks

    2 Answers

    Code error number p0135

    P0134....O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)

    P0135....O2 Sensor Heater Circuit (Bank 1 Sensor 1) heater in the O2 sensor has packed up first sensor before the cat

    Nov 27, 2010 | Jeep Grand Cherokee Cars & Trucks

    1 Answer

    Sensor Heater Circuit. (Bank 1 Sensor 2)

    Sounds like maybe a wire to the o2 sensor is broken or the o2 sensor needs to be replaced in Bank 1 Sensor 2.

    Oct 15, 2010 | 1999 Toyota Avalon

    3 Answers

    Reccieved P0141, P0147, P0340 as emission diagnostic trouble codes. What do these mean?

    P0141....O2 Sensor Heater Circuit (Bank 1 Sensor 2)

    P0142....O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)

    P0143....O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)

    P0144....O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)

    P0145....O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)

    P0146....O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)

    P0147....O2 Sensor Heater Circuit (Bank 1 Sensor 3)

    P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor)

    Sep 20, 2010 | 1997 GMC Sierra

    2 Answers

    I have a check engine light on my ob2 reads po135 whats that ?

    o2 sensor heater circuit malfunction bank 1 sensor 1 you need to replace the 02 sensor

    Aug 15, 2010 | 1998 Honda Civic

    2 Answers

    The check engine light produced codes p1150 and p1155 on a 2000 toyota avalon xls.

    All cars sold in the US after 1995 use the same on board diagnotics called OBD-II. The codes are the same. Search OBM-II error codes and you'll get a listing.

    P1150 Air/Fuel Sensor Circuit Range/Performance. (cylinder bank 1 Sensor 2)

    P1150 may mean that one or more of the following has happened:
    water or corrosion in the O2 sensor connector, loose terminals in the connector, wiring burnt on exhaust components, open or short in the wiring due to rubbing on engine components, holes in exhaust allowing unmetered oxygen into exhaust system, unmetered vacuum leak at the engine, bad O2 sensor or bad PCM.

    P1155 Air/Fuel Sensor Heater Circuit. (cylinder bank 1 Sensor 2)
    P1155 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 or O2 heater circuit wiring high resistance

    Solution :Replace oxygen sensor and see if the problem goes away.

    Nov 16, 2009 | 2000 Toyota Avalon

    1 Answer

    Code po141 heater circut sensor/where do i find this sensor? where is bank 1

    code is not for heater circuit,
    code p0141=O2 Sensor Heater Circuit Bank 1 Sensor 2
    that means its an oxygen sensor located in bank 1 which is the drivers side,sensor 2 means its the downstream sensor after the convertor

    Nov 15, 2009 | 1998 Pontiac Grand Am

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