My Service Engine soon light came back on. I checked the OBD2 code. I got a P2539 "Low pressure Fuel sensor circuit". That was the only code listed on the reader. What is a Fuel sensor circuit and what can I do about it? Is it a problem?

Thanks,

Mason

 

As we tell everyone-- model, year, mileage is all needed before we can look into the crystal ball ;-)

When was the last time you replaced the fuel filter?

regards,

Geoman

 

Ooops! That makes sense. My LR Discovery II is a 2001, but I had previously planned to install a new fuel filter and forgot to install it, so your filter answer makes good sense even though I left off the model and year.

Thanks!

Mason

 

Mason, your D 2 does not have an external fuel filter, only the D1's had them, yours has a sock in the fuel tank but it won't cause that fault code to come up.

Mike

 

Ok, I'll bite. What will cause an OBD2 code of 2539 to come up?

Thanks,

Mason

 

A bad fuel pressure sensor, can't tell you where it is located though.
Mike

 

After discussing this with a Land Rover master tech, it appears that the fuel delivery is regulated at the pump. There is no "return" loop as on earlier vehicles, regulated by a pressure switch. So-- it's looking like you have either a weak pump (in the tank) or the sock filter is partially obstructed with crud.

regards,

Geoman

www.eurotekapg.com

 

Thanks.

As you might have guessed from my inquriy, I don't know much about LR's. Can you tell me about this "sock" filter that has been referred to? Is it actually in the tank? Can I get at it and clean it, if as you speculate, it is crudded up? Are the sock filters available at normal autoparts places, or is it Unique to LR dealerships?

Thanks,

Mason

 

The sock filter is on the end of the fuel pick-up tube, and this whole assembly-- that includes the fuel pump-- is inside the fuel tank. If it was me, I would first have a pressure gage fitted to the fuel rail on the engine (there is a fitting there for this purpose) and see exactly what is going on. The measurements needed are:

Pressure when just turning the key to the on position (engine not yet running)
Pressure when the engine is running at idle
Pressure when you bring the rpm up to about 2000

In addition, you need to observe the gage after engine shut-down and see if it is "holding" pressure (for at least 30 minutes).

This diagnosis will tell you if you have more than just a partially obstructed sock filter. Get those values and post them here. We can then give you better advice.

Regards,

Geoman
www.eurotekapg.com

 

Thanks Geoman,

Wow! I'm beginning to see why LR has one of the worst customer satisfaction reputations in America? How much can I expect it to cost me to change what would be about a $2.00 part in almost any other car?

Mason