Question about 2004 Dodge Stratus
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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Posted on Jan 02, 2017
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