2004 C5 2l Hdi 138bh

[Oldmicrochip]

Does anyone know where it is, and how you can get to it to top it up?? Tanks

[mlkey]

Does anyone know where it is, and how you can get to it to top it up?? Tanks

 

Its under the back seat, drivers side. Lift the seat base and you will see a very large round black cover. Its under there.

[Johndouglas]

Its under the back seat, drivers side. Lift the seat base and you will see a very large round black cover. Its under there.

 

The fuel tank is. The small additive tank is behind the wheel arch.

[davidad]

The fuel tank is. The small additive tank is behind the wheel arch.

I stand to be corrected but I think the eloys additive tank has to be filled from underneath the car.

[Johndouglas]

Yes - the filling is done underneath the car and the tank is close to the nearside wheel, under a heat shield. Tubes for filling come with the kit.

[techbod]

BUT you still have to reset the ECU otherwise it will throw a fault code because of the FAP system and its a dealer job unless you know some one with the diagnostics, the FAP is linked to the emissions and its a filter in the catalyst which has to be set approx 56k and they clean the filter with diagnostic tools ( basically a rip off ) because they tend to say the catalyst is screwed and the cost is £600 ish but im sure its been covered and that's why I wont buy one ( the cost of today's technology is painful ) so called GREEN TAX

[Johndouglas]

Before you rush out and buy Eolys fluid, you should know that there are two types - DPX42 and Eolys 176. The first is used on the early vehicles and the 176 is for the Mk2's and the last of the Mk 1's. You need to refer to the RP number if your car is borderline. If yours is a Mk2, the fluid and filter should last around 80000 miles before a topup is required. The normal running of the engine burns off the carbon particles that get trapped in the filter. That's what the eolys fluid is for. It's the residue of the fluid that eventually blocks the filter. A dealer will replace your blocked filter with a 'cleaned' one but I know of one or two guys who have removed theirs and cleaned it with a pressure washer.

 

Early C5's had a float in the fluid tank and if the level was not allowed to get too low, the 'low level' warning never appeared, so a reset with a Lexia was not required. Later fluid tanks don't have the float. The ecu records how much fluid it has added to the fuel tank and how much is left in the reservoir. Eventually the warning will appear which needs to be cancelled with a code reader.