Fuel pressure code P2540?

Tiny
BHAMDOC1
  • MEMBER
  • 2008 MERCEDES BENZ E63 AMG
  • V8
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
It had few codes that could be related or not, I deleted all to see what stay, you can drive it with check engine light off till you start it again. The only code that came back is P2540:LOW PRESSURE FUEL SYSTEM SENSOR CIRCUIT RANGE/PERFORMANCE
Friday, January 9th, 2026 AT 9:49 AM

13 Replies

Tiny
BHAMDOC1
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Here us a video if that helps
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Friday, January 9th, 2026 AT 10:48 AM
Tiny
KEN L
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Yep, 9 times out of 10 it will be the sensor which is located at the tank on top of the low pressure fuel pump. Other possibilities are the fuel check valve is stuck open, the low pressure fuel pump is bad, or you have water in the tank (rare). Here is the location of the low pressure sensor so you can swap it out and then clear the codes. Luckily there is a trap door for the fuel pump. Check out the images (below). Please let us know what happens.
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Friday, January 9th, 2026 AT 12:07 PM
Tiny
BHAMDOC1
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Do you know the part number if it's not too much trouble plz
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Friday, January 9th, 2026 AT 12:32 PM
Tiny
KEN L
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Sure here is the part number for the low pressure fuel pump pressure sensor.

Bosch (1561530028) Fuel Pressure Sensor

Clear the code once completed, Ken
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Saturday, January 10th, 2026 AT 9:09 AM
Tiny
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Seems like this one maybe at the engine side. I thought we were talking about the one on too of fuel tank? Cause this one has bolts and in some sites says on fuel rail
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Saturday, January 10th, 2026 AT 9:42 AM
Tiny
KEN L
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Hmm, good call that one does not look right. Let try this one instead.

OEM Mercedes part 1635422818

Let me know, Ken
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Sunday, January 11th, 2026 AT 9:08 AM
Tiny
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Changed it, which was under the rear seats. Got a code p0193 without check engine being on
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Thursday, January 15th, 2026 AT 7:46 AM
Tiny
KEN L
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NICE! So we got the one problem fixed. Please start a new thread for the p0193 code. Which will involve the high pressure pump. Are you sure this car has the correct fuel, and the fuel is not contaminated?
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Thursday, January 15th, 2026 AT 11:17 AM
Tiny
BHAMDOC1
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Changed the fuel rail sensor because I kept getting p02540. As soon as I delete it and restarts it comes right back. Strange. So this sensor and the one on the left side of the rear seat which is the sender unit that also has a sensor, I replaced both with Bosch quality, I hear the right side pump strong every time I tirn the ignition on so not sure what else is there.
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Thursday, February 5th, 2026 AT 4:17 PM
Tiny
BHAMDOC1
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What do I do if I don't know if the correct fuel is in it? It has 1/2 tank, should I add a Techron cleaner?
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Thursday, February 5th, 2026 AT 5:17 PM
Tiny
KEN L
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Yep, that can help, especially if the car has been sitting.
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Friday, February 6th, 2026 AT 7:45 AM
Tiny
BHAMDOC1
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Any specific brand you tried and can recommend?
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Friday, February 6th, 2026 AT 8:35 AM
Tiny
KEN L
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This is what I would use

https://amzn.to/4raz0ym

Let me know what happens.

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Saturday, February 7th, 2026 AT 8:56 AM

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