Question about 2004 Dodge Stratus

2 Answers

04 Stratus R/T 3.0L 4Spd Auto. O2 Sensor code P0135 (has been replaced twice, thinking first replacement was bad) still has code no matter what. Still need to drive the 200 miles they say, but an interesting note is that I am still getting excellent gas mileage. Any help?

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  • 3 more comments 
  • icdrgon Sep 30, 2009

    The harness has been checked, and so have the connections

  • icdrgon Oct 01, 2009

    Yes the harness (02 sensor direct fit mfr part came with it) was replaced. As far as the rest of the main harnessit was checked out previously.

    They did indeed clear the computor and the light came back on in about 3 mins the first time, they cleared again and it came back on immediately.

    I am pretty much at wits end here since my mileage was never affected one bit and everyone including the mechanices are telling it should have been if the sensor was bad.

    I am now driving an illegal car (no inspection) for the first time in 30-years of driving. But i have to work to pay them for doing nothing...it seems.

  • icdrgon Oct 01, 2009

    I have said it was replaced.....

  • icdrgon Oct 02, 2009

    04 Stratus R/T 3.0L 4Spd Auto. O2 Sensor code P0135 (has been replaced twice, thinking first replacement was bad) still has code no matter what. Still need to drive the 200 miles they say, but an interesting note is that I am still getting excellent gas mileage. Any help?


    Comments:
    Sep 30, 2009 - The harness has been checked, and so have the connections
    Oct 01, 2009 - Yes the harness (02 sensor direct fit mfr part came with it) was replaced. As far as the rest of the main harnessit was checked out previously.
    They did indeed clear the computor and the light came back on in about 3 mins the first time, they cleared again and it came back on immediately.
    I am pretty much at wits end here since my mileage was never affected one bit and everyone including the mechanices are telling it should have been if the sensor was bad.
    I am now driving an illegal car (no inspection) for the first time in 30-years of driving. But i have to work to pay them for doing nothing...it seems.
    Oct 01, 2009 - I have said it was replaced

  • icdrgon Oct 04, 2009


    The Sensor that is in there now is the third sensor, all have been original dodge parts installed by dodge service. They have stated to me that the voltage and resistances check out. As an engineer I have the equipment here and i even confirmed this on the original part as well, also put it in my wifes sebring and it seems to work fine as not a single light came on after about an hour of driving.
    As I said I am at wits ends...and so is the dealer. So far this PoS has cost me $750 and there is no result and also I am now without the car as it has lapsed inspection...is it time to just get rid of it and get some cheap foreign throw away car, like a honda?

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  • Master
  • 333 Answers

The reason your gas mileage is unaffected is the code is for the heater portion of the O2 sensor, not the actual oxygen detection portion.

Each oxygen sensor has a small heater built into it to get the sensor up to operating temperature immediately when you start the car. This helps get more accurate readings from the sensor without having to wait for the engine to warm up.

The fault you have is indicating a problem with the heater portion.... this is incredibly common on Denso sensors, which you likely had originally. It is possible however there is a power supply problem going to the heater circuit.

First off, is the replacement sensor a genuine Dodge sensor? Aftermarket cut and crimp sensors are NOT a good idea for a multitude of reasons, I will get into later if you request. If you do not have a genuine sensor installed, I would do that first.

If you do have a genuine Dodge sensor installed, you need to find the cause of the heater failure.

Do this by testing the resistance across the heater element of the sensor while it is disconnected. The wires ont he sensor to test are the red wire and the blue/white wire.
You should see approximately 4ohms to 8ohms resistance. If you see OL or infinite resistance, the element is burnt out and the sensor requires replacement.

If the resistance is in check, turn the ignition on and connect a voltmeter between terminal one (red wire) of the engine harness (not on the sensor) and battery ground. You should see battery voltage (~12V)

If you do not, check your wiring for damage all the way back to the fuse box (the MFI relay supplies power to this heater).

If you do have battery voltage, again turn the ignition on and check resistance between ground and terminal 3 (blue/white wire) on the harness side (not on the sensor) and battery ground. You should se 0.000 for nearly no resistance.

If you have infinite resistance, check your wiring from the connector back to the ecu for damage. If none is found, the ecu is failing to initiate ground for the heater, and is at fault (HIGHLY UNLIKELY).

Please let me know if you need clarification on anything, and remember to rate my answer if it has helped you when we're done!

Posted on Oct 02, 2009

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  • Superbovine Oct 02, 2009

    All your comments just showed up at once.

    Again the mileage concern will be unaffected as the sensor itself is "sensing" it just isn't preheating.

    There is a such thing as brand new bad parts, though it is unlikely. If your voltage to the heater wire is good and your ground to the wire is good, there is nothing else it could be except the sensor element.

    Conversely, if you are certain the sensor is good (did they try it in another vehicle? did they test the element for resistance? it sounds like they don't fully understand the code if they are talking about gas mileage), then you must have a wiring issue.


  • Superbovine Oct 04, 2009

    If you tested the sensor and resistance on the heater circuit is in spec,
    You checked the power supply to the heater circuit and it is in spec,
    And you tested for ground signal to the heater and it is in spec,

    The only remaining thing it can be is an ecu.
    This is highly unusual, but not impossible. If you are absolutely certain you tested those three things correctly and accurately and they all passed, the ecu has an internal fault.

    Double check your tests just to be sure, as this is very unusual and ecus are expensive.


  • Superbovine Oct 04, 2009

    Also, just to clarify, this is the firewall side top sensor you are working on correct? The reason I ask is I had someone last night that was going through a similar situation, and the shop that was working on their car was fooling with the wrong sensor; they did not know which side was bank 1.



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  • Master
  • 1,986 Answers

You said you replaced the O2 Sensor.

Was the wiring and harness replaced as well as there may have been a short in the wiring that could have triggered this code



Posted on Sep 29, 2009

  • super_guy Sep 30, 2009

    If everything checks out, then I would assume the computer will require to run it's diagnostics and once it determines the issue isn't there then it'll clear the code. I'm just surprised they didn't clear it initially after the fix

  • super_guy Oct 01, 2009

    I know this may sound stupid, but when they changed the sensor, I'm going to assume they changed the right one. Odd that the code keeps coming up

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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: easyautodiagnostics.com).
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  • 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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    1996 honda accord o2 sensor versus Catalytic converter codes p0135 and p0141


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    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.

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