2006 Chrysler Town and Country rough idle and drivi g

  • 3.8L
  • 6 CYL
  • 2WD
Engine began shaking a lot. After I was able to look into it I got a p0302 cylinder 2 misfire. I swapped out all the spark plugs which did not help then after playing for a minute with the wires determined it was the coils. Swapped out the coils and it got rid of the 302 but replaced it with a 300. It doesn't run as rough but there is some roughness to it. So I wasn't sure but I decided to disconnect the battery to reset the computer just in case the computer was making it run rough because it didn't know it was fixed. Wife drove it to work a d back and I checked the codes again. 300 was gone. Now I have p2097. Could any of the above caused the 2097 code. I know its an o2 sensor but before I begin swapping parts and emptying my wallet, I would like to know if something else is causing the problems. Secondly, while my wife was driving she said "gas cap" came up on the display. I've never seen that before and was wondering if it could be and how related to the 2097 code and/or the replacement of the coil.
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Thursday, December 10th, 2015 AT 6:03 PM

1 Reply

Expert: mcleodagency replied 2 years ago.

Mcleodagency :
Hello my name is Don and thanks for asking your question! P2097 CHRYSLER - Downstream Fuel Trim System 1 Rich.
Tech notes
Before replacing the Heated Oxygen Sensor, inspect the sensor connector for signs of damage, water ingress, or corrosion
P2097 CHRYSLER Description
The conditions that caused this diagnostic to fail is when the upstream O2 Sensor biased from an exhaust leak, O2 sensor contamination, or some other extreme operating condition. The downstream O2 sensor is considered to be protected from extreme environments by the catalyst. The Powertrain Control Module monitors the downstream O2 sensor feedback control, called downstream fuel trim, to detect any shift in the upstream O2 sensor target voltage from nominal target voltage. The value of the downstream fuel trim is compared with the lean thresholds. Every time the value exceeds the calibrated threshold, a fail timer is incremented and mass flow through the exhaust is accumulated. If the fail timer and accumulated mas flow exceed the fail thresholds, the test fails and the diagnostic stops running for that trip. If the test fail on consecutive trips, the code will set. Your vehicle has 2 upstream and 2 downstream o2 sensors
Possible causes
- Faulty Heated Oxygen Sensor
- Heated Oxygen Sensor harness is open or shorted
- Heated Oxygen Sensor circuit poor electrical connection
- Exhaust leaks
- Contaminated Heated Oxygen Sensor
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Thursday, December 10th, 2015 AT 6:44 PM

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