Question about 2003 Toyota Tundra

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O2 sensor code

The scan tool shows that the #1 sensor in both bank 1 and bank 2 are bad on my 2003 tundra, are these upstrem (before the catylitic converter) or downstream (ater the converter) ?

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  • rgreene_59 Jan 11, 2009

    thanks to work4it for your answer


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They are up stream befor the cat or cats

Posted on Jan 11, 2009

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I have a 2007 jeep commander code P0153 O2 sensor slow response( bank 2sensor 1) replaced O2 light came back on later that day same code replaced O2 sensor again later that day check engine back on

What type O2sensor did you use ? Aftermarket ? Jeep's ,Chryslers , dodge are picky . WARNING Aftermarket Oxygen Sensors Chrysler part 1 Did you test or just replace the O2 sensor . P0153 Jeep O2 sensor 2 1 Slow Response If you don't have the tools like this guy uses an have the know how it's tough to fix problems like this .

Mar 24, 2016 | Jeep Cars & Trucks

1 Answer

Where is Bank 2 sensor 1 oxygen sensor on my 2007 tundra 5.7

Bank 1 is always the sameside of the engine as the number one cylinder.
Bank 2 is always the other side of the engine.
Sensor 1 is always before the cat
sensor 2 is always after the cat.

Cylinder number 1 on this engine is on the drivers side. So bank 2 is the passenger side of the engine and sensor 1 will be located before the catalytic converter.

Nov 17, 2015 | 2007 Toyota Tundra Limited

2 Answers

I have a 98mitsubishi montero my check ingine light is on i hooked up my computer to read the code it reads bank 1/2 P0161oxygen sensor which oxygen sensor is the one on the driver side or passenger side

Bank 1 is on the side that cylinder number 1 is on, and 2 is on the other . Look up your firing order and you should find it fairly easily. And sensor 1&2 refers to before or behind catylitic converter.

Mar 28, 2015 | 1998 Mitsubishi Montero

2 Answers

Po152 04 dakota 3.7 o2sensor bank 2 sensor 1 location and cause can this cause to run rich or random missfire

BANK 1 Is On Same Side As Cylinder 1---Therefore Bank 2 Is The Other Side--Sensor 1 Is Top Sensor (close to engine) YES--Can Cause To Run Rich And Random Misfire. So Can A Injector. You Probably Should Have It Scanned (in data stream) To Check Function--If It Is Bad, It Will Show. DO NOT REPLACE WITH UNIVERSAL O2 SENSOR.

Feb 26, 2015 | 2004 Dodge Dakota

1 Answer

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

    2 Answers

    Need to locate oxygen sensor 1998 camry v6

    follow your exhaust system you should see them in the pipe you have 1 up near manifold or in the manifold and the other after the catalic converter 4 cycl have 2 6 cycl have 4 also you have up stream bank 1 sensor 1 bank 2 sensor 2 bank 1 sensor 2 bank 2 sensor 1 and downstream as well so some models before cat converter and after

    Jul 04, 2014 | 1999 Toyota Camry

    1 Answer

    1,3,5,7 cylinder miss fire

    Bank1 failure.

    my guess, those DTCs off a cheap scan tool>? why not post source and real codes, no lie P0301 is real. but off what?

    real engine: Name.

    4.7 L 2UZ-FE V8

    VVT-i variant??? got VVT? IF ONE SIDE FAILS, misfire there. if cam retarded. if bad, can be 14deg retarded, (huge)

    see cam action here.

    2003 Tundra.

    if using a full real scan tool that sees all toyota extended DTCs , you might see VVT errors, $20 tools and lame autozoned , blind .

    there are 4 sensors there, id bet there are codes you missed!

    P0301,3,5, and 7, DTC, ONLY?

    bad coil packs? no.

    thats the whole left bank, bad.

    RF 2-4-6-8

    LF 1-3-5-7

    so, VVT bad on left bank or coil pack ,

    yours has 8 COP coils, so its not 4 bad COPS.

    a real mech sees all this in 1 second , online, impossible

    nor country. sold.\'

    could the timing belt slip only on one side

    did you do timing belt service, on time, if not, bingo.

    misfire is

    bad compression (vvt?)

    bad spark , no, not all 4

    bad fueling, but there is only 1 maf/map, and one full injection rate there so not fuel mix.related.

    here is a tool (most AZ stores clueless)

    that reads the enhanced DTC of Toyotas

    using a 1996 tool , misses the boat.

    but id bet your VVT is bad. left bank.

    the real tool might help. here.


    P0011 Diagnostic Trouble Code Discussion for
    Camshaft 1 Position Sensor Target Performance
    P0012 << or this>? P0020/21/22?

    the FSM shows the manual tests for these VVT parts.

    Feb 14, 2014 | 2003 Toyota Tundra

    1 Answer

    2003 lincoln navigator 4x4 V8 5.4L system adaptive fuel too lean bank 2. Where's bank too

    The sensor on bank two is the side with cylinder number 2.
    The problem may be low fuel pressure or a vac leak.

    Sep 20, 2012 | Cars & Trucks

    1 Answer

    Location of the bank 1 sensor 2 on th engine?

    "banks" refer to the sides of the engine. Bank 1 is always the same side of the engine as cylinder number one. Bank 2 is always the other side of the engine.

    "Sensor" refers to upstream or downstream of the catalytic converter. Sensor 1 is upstream of the cat and sensor 2 is downstream of the cat.

    Bank 1 sensor 2 would be the same side of the engine as cylinder number 1 and downstream of the catalytic converter.

    Dec 28, 2010 | 2000 Toyota Tundra

    1 Answer

    I am a master tech for a gm dealership. I have dealt with many domestic driveability issues, however I drive a 2003 tundra 4.7 v8. While I take some grief from my fellow employee's, I drive the toyota...

    #1 When you replace 02 sensors you should always replace all of them. Otherwise the new 02 sensor will be returning its Data back to the computer faster than the other old ones and this in itself may cause problems. #2 the P0420 indicates that the Catalysts System Efficiency is below the threshold on bank #1 And yes put in all new sensors and that means bank 1 sensor #2 as well. And then if the P0420 code returns replace the Catalatic converter on Bank#1.Please let me know the results. Good Luck and have a good XMASS.

    Dec 15, 2010 | Toyota Tundra Cars & Trucks

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