P1166

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Grahambeveridge225
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P1166

Post by Grahambeveridge225 »

Hi guys. Got my car a major service last week. New filters and oil all round.
Still got a lack of power when accelerating and now getting the above fault code.
Classic example on motorway in 6th gear put foot down and engine light came on anti pollution.

Any ideas where I can look next?
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GiveMeABreak
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Re: P1166

Post by GiveMeABreak »

Here's the description for this code Graham. It will clear after several full load accelerations for 10 seconds each over a 5 minute period as stated. If it doesn't clear, then time to start looking at the possibilities shown.

Obviously, cruise will be disabled and engine power will be limited all the time the fault is showing.
Fault codeP1166
After sales description of the fault codeRail pressure regulation: Supplementary not coded
Description of the diagnosticsThe fuel high pressure common injection rail pressure measured by the engine ECU exceeds the maximum threshold of 1800 bars for 6 s
Conditions of activation of the diagnosticsConsult the associated contexts for the Pcode forwarding conditions
Conditions of disappearance of the faultDriving for 5 minutes with several full load accelerations for 10 seconds
Down-grade modes if fault presentDeactivation of the speed limiter
Deactivation speed limiter until the next time the ignition is switched on
Deactivation of the cruise control
Deactivation cruise control until the next time the ignition is switched on
Request for Delayed Engine Stop
The ECU limits the fuel flow
Switching on of the warning lamp and/or warning messageWarning lamp MIL
Warning lamp STOP
Main customer complaints likelyEngine hesitating, cutting out
Lack of power
Suspect areasElectrical harness
Connectors
High pressure fuel pump
Engine ECU
Fuel high pressure sensor
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Marc
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EDC5
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Re: P1166

Post by EDC5 »

I had this code appear not too long ago during a full throttle acceleration on the motorway. I had to clear the code with Lexia and it hasn't come back since touch wood.
Grahambeveridge225
Posts: 56
Joined: 06 Aug 2017, 14:48
Location: Edinburgh
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Re: P1166

Post by Grahambeveridge225 »

Thanks guys. I think I'm in the last category. Back to the garage 😢
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GiveMeABreak
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C5 MK II 2.0 HDi Exclusive Obsidian Black
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XM 2.0 Turbo Prestige Emerald Green Pearlescent
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XM 2.0 SX Polar White
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Re: P1166

Post by GiveMeABreak »

It can be intermittent and that's why they suggest a few heavy accelerations, getting the power on for 5 minutes or so at full load. If it's the rail pressure sensor, these really should be replaced as part of the rail which incorporates the sensor.

I posted about it in your last 'arrrrrrr' post where you were getting the same code. Did you take it in for work then Graham?

viewtopic.php?f=3&t=61800&hilit=rail+pr ... or#p599677
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Marc
Grahambeveridge225
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Re: P1166

Post by Grahambeveridge225 »

Thanks Marc. I'm full of notes to get it sorted.. Can't thank you enough.
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