P0141 and bad gas mileage?

[TechnicolorSkies]

Hello! My Montana recently threw a P0141 code. If I understand correctly, this means that the downstream 02 sensor has a problem with the heater circuit, and should be replaced. Does this sensor have an effect on gas mileage, or is it only for emission testing? I'm planning to go on a 3,000 mile trip, and need to know if this should be replaced before leaving.

 

[sergeimoskva]

Hi!
Your P0141 code is the oxygen sensor on the exhaust system that is almost directly under the passenger seat (this sensor only affects exhaust emissions) . Look under the van at that location and you will see it just to the rear of the exhaust converter . It just unscrews like a spark plug.
First, check the following:
Damaged wiring
Damaged electrical connector
... Otherwise - replace the sensor

 

[melsg5]

bad fuel economy is the only symptom listed so replace it
https://www.obd-codes.com/p0141