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Hello All,
After being in the Arctic in winter I had one or two water in fuel warnings.
During fueling while it snows I've seen some snow flakes fall into the fuel opening and after driving on snowy roads there's always snow packed behind the fuel cap so I was accepting the warning.
They also disappeared on their own after an ignition cycle.
Recently, almost commuting between Mainz and Amsterdam every weekend, I've had the warning too, 3 times, WITH the Restricted Performance triangle.
Usually right after a cold start.
The car doesn't actually seem restricted, not like a RP that's turbo change-over valve related (had that too after being parked in -15C for days, also disappeared by itself after a warmed up car and an ignition cycle)
Using a fair amount of fuel the last couple of weeks I could not 'accept' there was actually water in the fuel.
As far as I read the WIF sensor detects a change in resistance between diesel (high resistance) and water (low resistance)
To me, a proper ground of the housing would make the resistance to ground (if i measures that way) lower, and that's not good.
The comments about using vaseline on the contacts triggered a memory seeing 'grease' on electrical connectors before, in other cars.
Some googling gave me Dielectric Grease.
As that's silicone based it may be a better option than vaseline (oil based) when it comes to longevity.
So that's what I'm going to try soon, it makes sense.
A 'short' between contacts lowers resistance making the ECU think "Water!"
I will report back  2012 4.4TDV8
2000 Honda S2000
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30th Mar 2025 9:00am
