Question about 2000 Mazda MPV

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Replaced all oxygen sensors on 2000 mpv but light came back on

One sensor was bad but i decided to replace all but it shows that one is bad . Had it replaced again but the light came back on again

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  • kirnell Jan 12, 2009


  • Scott  Moore
    Scott Moore May 11, 2010

    I'm guessing that you are having the codes pulled by a shop or parts store?



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Oxygen sensors are only indicatores of oxygen in the exhaust, You could have an exhaust leak and the oxygen in the exhaust is reading to lean, that will give you an O2 code. Did you have the codes erased also. sounds like you have a too lean or to rich situation or maybe an egr valve malfunction. I hope this helps you

Posted on Jan 12, 2009


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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

    My Dodge Stratus (1998 4 cyl) check Engine light is on. The error code says oxygen sensors were bad. Both oxygen sensors have been replaced. After resetting the check Eng light. The oxygen sensor

    the upper 02 sensor is for air fuel mix while the secondary 02 sensor is for the operation and status of the catalitic converter are you sure the catalitic converter is not plugged. Could be if you have had a loss of power

    Sep 16, 2014 | 1998 Dodge Stratus

    2 Answers

    A scanner turned up no power to bank 1 sensor 1 on 2000 mazda mpv. all fuses are good

    What was the actual code ? The sensor produces its own power unless you are talking about the heater inside the sensor.

    Aug 04, 2014 | 2000 Mazda MPV

    1 Answer

    How to test oxygen sensor

    When we detect a lean mixture code from our vehicles, our first reaction may be to replace the oxygen sensor. However, testing oxygen sensors before replacing them is a good idea. The best way to check the operation of the sensor is to run a simple test. And all you need is a voltmeter. A voltmeter is usually cheaper than car diagnostic tools and is available within 100 eurs. Here I will use an original Autel PowerScan PS100 for 56 eurs from EOBD2.FR.
    How to check if your oxygen sensor is bad and needs to be replaced:
    Step 1. Find the oxygen sensor sensing wire, connect Autel PS100 to the feedback wire and ground and then choose the mili volt operation.
    Step 2. Turn on the ignition key to start the vehicle and run the engine at idle to warm it up. Watch data on PS100. The voltage should move slightly at whatever voltage the sensor is centered at.
    Step 3. When you pull the oxygen sensor data stream up, the output voltage from the sensors should constantly bounce between high and low with the meter dropping and rising, as the engine is running in closed loop. The volt meter should stabilize at the original operating voltage when the engine returns to idle.
    If your oxygen sensor does not show the above reactions, it is probably that it is bad.
    Note: If the error code shows a malfunction exists with related components such as an engine misfire or other engine problems, please do not perform this test.

    Jul 09, 2014 | 2000 Buick LeSabre

    1 Answer

    2000 chevrolet silverado shows bad oxygen sensor replaced still misses bad

    SOUNDS LIE YOU NEED TO REPLACE THE SPARK PLUGS AND IGNITION WIRES9sparkplug wires. have they been replaced?

    Apr 11, 2012 | Chevrolet 1500 Cars & Trucks

    1 Answer

    Check engine light on, replaced oxygen sensor before catalyst,

    • Water or corrosion in the 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
    • Bad PCM

    Jun 18, 2010 | 1999 Lexus RX 300

    1 Answer

    I need a diagram of the exhaust system on a Mazda 626

    0996b43f80203328.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Component Location Chart-2000 MPV

    1 PCM 2 Mass air flow (MAF)/intake air temperature (IAT) sensor 3 Throttle position (TP) sensor 4 Fuel tank pressure sensor 5 Engine coolant temperature (ECT) sensor 6 Crankshaft position (CKP) sensor 7 Camshaft position (CMP) sensor 8 Knock sensor 9 Heated oxygen sensor (HO2S) (front, LH) 10 Heated oxygen sensor (HO2S) (front, RH) 11 Heated oxygen sensor (HO2S) (rear, LH) 12 Heated oxygen sensor (HO2S) (rear, RH) 13 EGR boost sensor 14 Power steering pressure (PSP) switch 15 Main relay

    0996b43f8020330c.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Component Location Chart-2001 MPV

    1 PCM 2 Mass air flow (MAF)/Intake air temperature (IAT) sensor 3 Throttle position (TP) sensor 4 Engine coolant temperature (ECT) sensor 5 Crankshaft position (CKP) sensor 6 Camshaft position (CMP) sensor 7 Knock sensor 8 Heated oxygen sensor (HO2S) (front, LH) 9 Heated oxygen sensor (HO2S) (front, RH) 10 Heated oxygen sensor (HO2S) (rear, LH)* 11 Heated oxygen sensor (HO2S) (rear, RH)* 12 EGR boost sensor

    0996b43f8020330f.jpg enlarge_icon.gifenlarge_tooltip.gif Fig. Component Location Chart- 2002-06 MPV

    May 22, 2010 | 2004 Mazda MPV

    1 Answer

    Oxygen sensor replacement

    It's something you can with simple tools, you have four O2 sensors. Your going to have to get the truck rescanned or if you have the DTC code, you can find out which O2 sensor has gone bad so you can replace it. Your going to have Two upstream O2 sensors on each exhaust bank, one O2 sensor before the Catalytic Converter, and the last one after the Catalytic Converter. Its like replacing a Spark plug and you can pick up the O2 sensor at any large Auto Parts store with a can of WD 40. Just unclip the wire leads to the O2 sensor and then with a O2 sensor socket or hint close end wrench and hammer, you can remove the O2 sensor from the exhaust pipe. Good luck and be safe.

    Nov 22, 2009 | 2004 Chevrolet Silverado 2500HD

    2 Answers

    2001 Mazda MPV upper front oxygen sensor change

    No you don't have to move any of that you need a "crow foot" type oxygen sensor it looks like a short brake line wrench that you can put a 3/8 ratchet on it with an extension. This will help you to get this sensor out. Good Luck

    Dec 30, 2008 | 2000 Mazda MPV

    1 Answer

    2000 dodge intrepid 3.2 engine light on yesterday, code PO432, should I replace the upper oxygen sensor?

    this is the code for catalytic convertor efficiency. if you decide to change the 02 sensor change both of the sensors for the left head...there is a good chance the convertor is going bad also depending on the miles

    Dec 21, 2008 | 2000 Dodge Intrepid

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