Questions and Answers

Plymouth Grand Voyager P0137 Q. Congratulations on a very informative site! In December we had our third child, so we decided on buying a used Plymouth Grand Voyager SE. Since this is a used car I decided on doing the following to it: Replaced air filter, spark plugs, ignition wires, PCV valve, cap, rotor, timing belt, water pump, belts, coolant and changed the oil and filter.

I drove it to Jacksonville from Miami and the van works very good.

Here are my two questions:

1. The MIL turned on with code P0137. Can I fix this problem myself and where do I start?
2. The transmission works fine and the fluid looks good. Should I have the transmission fluid flushed on a high mileage van? (The job would be done at the dodge dealer.)

• 1998 Plymouth Grand Voyager SE
• 3.0 liter engine
• 4 Speed automatic transmission
• 92,000 miles
• Fuel Injection
• P/S, Dual A/C, Cruise Control

Thanks for your help...

A. P0137 is "Downstream O2 Sensor Shorted To Ground". This means that either the O2 sensor itself is bad, or the wiring is damaged. I would tend to think it's the O2 sensor that is the most likely possibility.

I would not recommend a transmission flush, but rather simply replace the transmission filter and whatever fluid came out with it.