# 04 Ford Expedition Emissions Problem

**URL:** <https://community.cartalk.com/t/04-ford-expedition-emissions-problem/22758>\
**Category:** Maintenance/Repairs\
**Created:** [December 1, 2008, 12:44am UTC](https://community.cartalk.com/t/04-ford-expedition-emissions-problem/22758 "2008-12-01T00:44:34Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![busterbutler](https://avatars.discourse-cdn.com/v4/letter/b/ecb155/32.png) [@busterbutler](https://community.cartalk.com/u/busterbutler)\
**Post date:** [December 1, 2008, 12:44am UTC](https://community.cartalk.com/t/04-ford-expedition-emissions-problem/22758/1 "2008-12-01T00:44:34Z")

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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?

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**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\
**Post date:** [December 1, 2008, 12:03pm UTC](https://community.cartalk.com/t/04-ford-expedition-emissions-problem/22758/2 "2008-12-01T12:03:11Z")

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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?

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**Author:** ![busterbutler](https://avatars.discourse-cdn.com/v4/letter/b/ecb155/32.png) [@busterbutler](https://community.cartalk.com/u/busterbutler)\
**Post date:** [December 10, 2008, 2:59pm UTC](https://community.cartalk.com/t/04-ford-expedition-emissions-problem/22758/3 "2008-12-10T14:59:17Z")

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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.

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**Author:** ![realbinky](https://avatars.discourse-cdn.com/v4/letter/r/a87d85/32.png) [@realbinky](https://community.cartalk.com/u/realbinky)\
**Post date:** [December 10, 2008, 3:24pm UTC](https://community.cartalk.com/t/04-ford-expedition-emissions-problem/22758/4 "2008-12-10T15:24:59Z")

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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.