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Fault code is P1166

Tiny
RIDGER
  • MEMBER
  • 2006 CITROEN PICASSO
  • 100,000 MILES
Replaced engine 1.6hdi with same engine code came complete with hp pump and turbo cambelt was allso done the only differance was the valve on the pump was in a diffrent position injectors have been coded to ecu but it will not start it starts but cuts out straightaway fault code is p1166 fuel rail pressure to high engine has only done 47000 miles the company I had it from told me it was a runner when it was removed can you please help thanks
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Friday, December 28th, 2012 AT 12:29 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It sounds like the fuel rail pressure sensor is not plugged it or is bad I would start by checking the connection and if good replace the sensor.

Roy
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Friday, December 28th, 2012 AT 1:04 PM
Tiny
RIDGER
  • MEMBER
  • 2 POSTS
Hi thanks for your reply I fitted the engine as I am a mechanic just wanted a second appinen but I am arguing with the supplyer of the engine because they are saying it must have happened since I have had it even though it has never ran since it was fitted I have never heard this but would it matter about the angle of the valve on the pump as the only differance is the old pump senser is at 45degrees and the orther pump senser is straight would this cause the fault my next step is to change the pump but soon as I remove it the waranty would be void
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Friday, December 28th, 2012 AT 4:13 PM
Tiny
TONYDOBBS
  • MEMBER
  • 1 POST
Hi I have the same problem with my 55plate, changed the pump and it was the same then changed the switch in the pressure rail and still the same. Dont know what to do now.
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Monday, March 25th, 2013 AT 7:55 PM
Tiny
MANFREDFROMGERMANY
  • MEMBER
  • 1 POST
I have the same problem. Have changed pressure-sensor and regulator.
Always pressure too high. I had to replace the ECU with a used one. Thanks all and greets from Germany
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Tuesday, September 1st, 2015 AT 9:55 AM
Tiny
ÅRHUSV
  • MEMBER
  • 1 POST
Hi everybody.

The P1166 fault code on your 2006 Citroen Picasso indicates that the fuel rail pressure is too high. This code suggests a potential issue with the fuel system.
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Monday, November 30th, 2020 AT 1:47 PM

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