04 Ford Expedition Emissions Problem

#1

I have a 04 Ford Expedition. Recently, I had emission problems. The car would unexpectedly jerk while driving. The “check engine” light came on. I replaced the catalytic converters. The “check engine” light is no longer on. However, the car is still jerking while driving. It feels like hitting a speed bump: a short “thump-thump” and loss of power, then it drives normally again. Any ideas? Does this sound like the O2 sensors are going out?

#2

Did you read the error code(s) what were they? The answer may be there.

It sounds like a transmission problem to me. Has the transmission fluid been checked? How many miles on your Ford? Has the transmission fluid been replaced?

#3

Sorry for the delay in responding. Out on a business trip.

I haven’t checked the error codes. Is that something a consumer can do or do I need to take the car into a shop?

The transmission has been regularly serviced. The Ford has 130,000 miles on it. The transmission fluid was changed at 120,000 miles.

#4

Only at 120K? yikes!

Take it to an autozone near you, they can read any codes for free (past codes are stored). It sounds like a non-emissions problem now, which may have caused the emissions issue earlier. You solved an effect, but not the cause.