sebastianfrank2
Laguna diesel fuel rail pressure sensor fault
Summary of the thread
The 2006 Renault Laguna diesel is experiencing engine check light activation, stalling, and reduced power, with a diagnostic scan indicating a faulty fuel rail pressure sensor. The symptoms suggest that the sensor could be the cause, though checking wiring, connections, and the fuel filter is advised. After confirming the wiring and filter are in good condition, replacing the sensor is recommended. Following this advice, the sensor was replaced, resolving the issues.
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4 comment(s)
sebastianfrank2 (community.author)
Thanks. I have inspected the wiring and connections, and they appear to be in good condition. The fuel filter was replaced recently as part of routine maintenance. Is there a way to definitively confirm that the sensor is the issue before I proceed with replacing it?
walterschubert3
If the wiring and fuel filter are fine, it strongly suggests a faulty sensor. Unfortunately, without more specialized diagnostic equipment, it's difficult to be 100% certain. Given the symptoms and error code, replacing the sensor is a reasonable next step. However, if you are not comfortable doing it yourself, taking it to a workshop for a diagnosis would be wise. I had to do that once. It cost me 240€, all included.
sebastianfrank2 (community.author)
Thanks. Based on your recommendation, I took the vehicle to a workshop. Following their inspection, they confirmed the rail pressure sensor was defective. After replacing the sensor the issues are resolved.
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RENAULT
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LAGUNA
walterschubert3
Those symptoms do indeed point towards the fuel rail pressure sensor. I had similar issues with a previous car – a faulty sensor can cause all sorts of erratic engine behavior. Have you checked the wiring and connections to the sensor itself? Sometimes a loose or corroded connection can trigger the same error. You might also want to verify the fuel filter is not clogged before replacing the sensor.