Question about 2004 Chrysler Sebring
The code description for Diagnostic Trouble Code (DTC) P0138 is "Oxygen Sensor Bank 1 Sensor 2 shorted to voltage" The oxygen sensor (O2S) voltage should always be between 0 and 1 volt. This code sets when the O2S voltage is greater than 1.2 volts for at least 30 seconds.
The code description for code P0117 is "Engine Coolant Temperature Sensor (ECT)Voltage Low". The ECT is a thermal variable resistor. The Powertrain Control Module (PCM) sends a 5 volt reference to the ECT and measures how much of this voltage returns to the PCM to determine engine temperature. This code sets when the ECT voltage signal is less than 1 volt.
Here's the kicker...which came first, P0117 or P0138? Low ECT voltage can cause the engine to run extremely rich and cause the O2S voltage to go high. This needs to be looked at with a scanner that can display the actual ECT and O2S voltages so they can be compared.
I would say that with the symptoms you are describing along with these codes, there is a GOOD chance that you have some kind of wiring harness damage or water in a connector that is shorting these two circuits together. This would definitely RAISE the voltage on the O2S circuit that is supposed to be low, and LOWER the ECT voltage that is supposed to be high.
Posted on May 19, 2011
Sounds like the EGR Valve is bad causing exhaust gasses to go back into the intake manifold which causes it to run rough as if it was being choked in winter time.
it is located on intake manifold it has a vacuum line running to it.
Posted on May 19, 2011
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Posted on Jan 02, 2017
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