PO135 O2 sensor heater circuit



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Thread: PO135 O2 sensor heater circuit

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    PO135 O2 sensor heater circuit

    I have a po135 error which is an O2 sensor heater circuit malfunction (Bank 1 Sensor 1) on my 2003 Caravan. Does this mean I have a bad sensor? I did not see any rat chewed wires or other damage. The sensor I see is on the exhaust manifold and will take someone with long skinny arms to replace it. Please advise. Thank you very much.

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    P0135 indicates the upstream oxygen sensor which is located on top of the exhaust manifold. It has a springy thing around the wire. I believe you have already located it from what you said. A special socket with a slit in it to accomodate the wire is used to remove / replace them. The Mechanic (very experienced) that did mine had a hard time, and although the manual said to remove it from underneath, he eventually got at it better from the top.
    Might want to clear the computer and see if it comes up again - may not.
    2007 GC SXT - Magnesium - S&G - 3.8L - 112,920 kms
    2002 GC Sport - Stone White - 3.3L - 311,200 kms
    2003 Jeep TJ Sport - 4.0L - 251,430 kms

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    Sounds like the heater element burned out. Mine burned out at 75,000.

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    Heater element? Is this heater element part of the O2 sensor that will be fixed when replacing the sensor?

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    Quote Originally Posted by DoubleACL View Post
    Heater element? Is this heater element part of the O2 sensor that will be fixed when replacing the sensor?
    Yes. It is a "complete" part that screws into the exhaust manifold and already has antiseize applied to it, in fact the instructions that come with it may prohibit the use of additional antiseize. The wiring comes integral with the sensor to plug into a connector about a foot away, so a special socket, with a slit, is required to install it. Take a look at http://shopping.yahoo.com/s:Automoti...nsor%20Sockets
    2007 GC SXT - Magnesium - S&G - 3.8L - 112,920 kms
    2002 GC Sport - Stone White - 3.3L - 311,200 kms
    2003 Jeep TJ Sport - 4.0L - 251,430 kms

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    If the heater element burns out, the circut becomes open. The lack of resistance trips the code, and the code indicates a problem with the circuit. If the wiring is O.K, then chances are the heater element in the O2 has burned out. Unfortunately, they are a ROYAL P.I.T.A. to access. When you are done with this job you will realize that when Chrysler builds these things they start with an O2 sensor and then start bolting parts to it until they have a van.

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