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Replaced both sensors in a 2004 Pontiac Grand Prix P0135 P0141

I replaced both sensors and after 500 miles and 3 days the check engine light cane on, the codes were for coolant temp (don't recall the exact code) and P0135 and P0141. I reset the codes and the next day the P0135 & P0141 came back. The O2 heat uses a compare to coolant temperature, could this be a coolant issue. Any suggestions are greatly appreciated

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  • sdj6 Jun 25, 2009

    The coolant code was temp out of range

  • Stan Cather
    Stan Cather May 11, 2010

    Both which sensors? o2? O2 heat uses a compare to coolant? What was coolant code? temp out of range, circuit open?

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A code P0135 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 = O2 heater circuit wiring high resistance = open or short to ground in the wire harness. 
What to do; = Repair short or open or high resistance in wiring harness or harness connectors.
= Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)
A code P0141 may mean that one or more of the following has happened:

Same as above: mentioned in P0135.
What do do is the same as above, so i am leaning towards and faulty wire harness since you have replaced both O2 sensors. Make sure the wire harness has no break in it or crushed connection clips. The other thing to look for is a bad fuse that is used to heat up the O2 sensor. It may not say O2 sensor on it, it may piggy back off something else so check all the fuse and make sure the O2 has a good ground and not corroded. Good luck and hope this helps. 

Posted on Jun 25, 2009

  • Harvey N Tawatao
    Harvey N Tawatao Jun 25, 2009

    The engine coolant temperature (ECT) sensor is a relatively simple sensor that monitors the internal temperature of the engine. Coolant inside the engine block and cylinder head(s) absorbs heat from the cylinders when the engine is running. The coolant sensor detects the change in temperature and signals the Power train Control Module (PCM) so it can tell if the engine is cold, warming up, at normal operating temperature or overheating. This is why it has a nick name "Master sensor" Input from the coolant sensor may be used by the PCM for Open/closed loop feedback control of the air/fuel mixture. The PCM may ignore the oxygen sensor rich/lean feedback signal until the coolant reaches a certain temperature. While the engine is cold, the PCM will remain in "open loop" and keep the fuel mixture rich to improve idle quality and cold drive ability. If the PCM fails to go into "closed loop" once the engine is warm, the fuel mixture will be too rich causing the engine to pollute and waste gas. A typical GM coolant sensor, for example, may have around 10,000 ohms resistance at 32 degrees F and drop to under 200 ohms when the engine is hot (200 degrees) Coolant sensors have two wires (input and return). A 5-volt reference voltage signal is sent from the PCM to the sensor. The amount of resistance in the sensor reduces the voltage signal that then returns to the PCM. The PCM then calculates coolant temperature based on the voltage value of the return signal. The coolant sensor is typically located near the thermostat housing, a few vehicles, the coolant sensor may be located in the cylinder head, or there may be two coolant sensors (one for each cylinder bank in a V6 or V8 engine) or one for the PCM and a second for the cooling fan. Keep in mind that many coolant sensor problems are more often due to wiring faults and loose or corroded connectors than failure of the sensor itself. The coolant sensor's impact on the engine management system, cold drive ability, emissions and fuel economy can also be influenced by the thermostat. If the thermostat is stuck open, the engine will be slow to warm up and the coolant sensor will read low. Or, if someone installed the wrong thermostat for the application or removed the thermostat altogether, it will prevent the engine from reaching normal operating temperature and cause the coolant sensor to read low. Recap. Check the wire to the Temperature Sensor, make sure it's not damaged and replace the sensor if wires are good since the sensor is not that expensive. You can go to Auto Zone and buy a new sensor and they will have the step by step instruction to replacing the sensor and replace the thermostat too just to cover all your base. Keep me posted, be glad to get your car running 100%. 

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Example may be like this; A bad spark plug sets off a firing code, the cylinder not firing causes the O-2 sensor to get an out of parameter reading, and finally the one cylinder dragging for whatever reason is making the vacuum real slow/low, and sets off another code to the Evaporator purge system. Put it all together it means it has dropped a cylinder due to bad spark plug, sticking or bad injector, and even the air filter being so stopped up it can't pull enough air. Clean the injectors, add a new fuel & air filters, and put in some new spark plugs

Posted on Jun 25, 2009

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