I have a 2004, E320 CDI. Lately the mpg has dropped a lot and the car sounds more 'tapity' if there's such a word. I spoke to a garage today for some advice and was told that it could be the exhaust pressure sensor or lambda sensor. I've never heard of these and I'm not sure if it's a job I can do or if it has to go to a garage. The garage said that the would put it on the machine to diagnose, which would cost £60, then it could be anything up to £400. The car seems to be running as normal and there's no warnings or malfunctions showing. Any advice would be greatly appreciated. Thanks

When my thermostat stuck open, my mpg went to crap. Check your temp gauge to make sure it's coming up to temp.

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Mark in MA
05 MB E320CDI 402k Granite Grey Metallic
05 MB E320CDI 267k Black
05 MB E320CDI 232k White
05 MB E320CDI 209k Tectite Grey
99 Dodge 2500 Cummins 5sp 148k
62 Jeep CJ-6 120k

Are you in the US or not? I didn't realize that we already got the CDI in 2004.

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"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes

1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."

His use of the £ symbols tells me he's in the UK.

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'80 300SD - '83 240D - '00 E55 AMG - '02 G500

My temp gauge is showing the same as usual.

Yes, I'm in the UK

Thanks guys

Lambda sensor is the oxygen sensor fairly easy to replace under the car.
Exhaust pressure sensor close to the oxygen sensor.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10