Finally had CEL checked and found that p0181 was causing the light. It says its the fuel temp sensor. Does anyone have any prior experience with this code? Not see what route to take.

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1996 E300D

Never seen that code before. Its a range/performance glitch, guessing that a sensor monitoring the fuel temp doesn't like what it see's. I don't believe the fuel thermo has any electrical connections, don't have one to look at anymore.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

The fuel temp sensor is part of the shut off valve on the side of the IP.

You can get to it by removing the washer fluid bottle and reaching in from the side, as opposed to taking the intake manifold off.

It is held on with two screws, T20 IIRC.

Be sure to renew the o-rings on the fuel lines (total of 3 connections) and the valve to IP body connection on the back side of the valve.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech