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Discussion Starter · #1 ·
Guys,

Can’t seem to find anything definitive on this error, I’m about to change the boost sensor, as found a smile bit of info on it..

Anyone managed to resolve this.

Symptoms are, Engine Fault! Reduce power pops up on dash, no error messages via scan tool, feels like turbo stops working…. (Hence the boost sensor) this happens if hard acceleration, nothing crazy, just try to get up to speed quicker than usual…

?!??


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2005 R53, 2005 R53 lightweight, 2008 R55S, 2012 R58FJCW, 2014 R60SD All4, 1996 Mini Cooper 35SE.
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try a different code reader perhaps, most error messages put something in there,

I'd look at the vac hoses perhaps first, oil contaminates them quite badly sometimes, so they can leak, detach, or collapse,
 

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Discussion Starter · #4 ·
try a different code reader perhaps, most error messages put something in there,

I'd look at the vac hoses perhaps first, oil contaminates them quite badly sometimes, so they can leak, detach, or collapse,
I’m based in Bedfordshire, any recommendations for a mini specialist who maybe able to do smoke test on boost hoses etc… changed the map sensor & still no joy..
only message stored for me is this one, doubt it’s related, but thought I’d share anyhow





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that's the first thing to deal with, new thermostat housing, which will mean new cross over pipe too probably,
 

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It is an engine sensor, the engine is controlled by an ECU which looks at inputs from the engine sensors, why wouldn't you clear a known engine sensor issue first before firing a random parts cannon at the car?
 

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Discussion Starter · #8 ·
It is an engine sensor, the engine is controlled by an ECU which looks at inputs from the engine sensors, why wouldn't you clear a known engine sensor issue first before firing a random parts cannon at the car?
There is no code, that’s the problem, apart from the Thermostat one. All I’m
Getting is the one attached & a engine fault reduce power message, which reduces boost most of the time


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There is no code, that’s the problem, apart from the Thermostat one. All I’m
Getting is the one attached & a engine fault reduce power message, which reduces boost most of the time


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????? There is no code apart from the code ?????

You need to get the KNOWN ISSUE sorted out first.
 

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you can't exactly ask the car 'what else might be wrong if the thermostat was working correctly' so you have to deal with that first, when it's function is restored and the ECU gets and interprets the right info the right way it will either highlight another problem, begin working properly, or leave you a symptom with not fault code, but still live data perhaps, regardless, you must address the stat fault irrespective of whether it changes a symptom.
 

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Discussion Starter · #12 · (Edited)
you can't exactly ask the car 'what else might be wrong if the thermostat was working correctly' so you have to deal with that first, when it's function is restored and the ECU gets and interprets the right info the right way it will either highlight another problem, begin working properly, or leave you a symptom with not fault code, but still live data perhaps, regardless, you must address the stat fault irrespective of whether it changes a symptom.
So, Thermostat message was an historical one, so been told it doesn’t need attention. However the issue is still present. Had a smoke test & no vac leaks.

Feels like I’ve found the issue, (see pics & video) when up to running temp the cold side of the turbo if can be moved with Minimal force away from the hot Side once cold it can’t be moved… I’ve replaced the nut & bolt that holds the v band but still no joy..

Was told it has a new turbo when I brought it, (it looked like it has, but why it moves when hot, is strange)

Any ideas??? Can it be repaired, has it come
Loose (ie take it off & mounted back together?)


At least it feels like I know what the cause is??



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Discussion Starter · #13 ·
So, Thermostat message was an historical one, so been told it doesn’t need attention. However the issue is still present. Had a smoke test & no vac leaks.

Feels like I’ve found the issue, (see pics & video) when up to running temp the cold side of the turbo if can be moved with Minimal force away from the hot Side once cold it can’t be moved… I’ve replaced the nut & bolt that holds the v band but still no joy..

Was told it has a new turbo when I brought it, (it looked like it has, but why it moves when hot, is strange)

Any ideas??? Can it be repaired, has it come
Loose (ie turn off & mounted back together?)

At least it feels like I know what the cause is??



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Wanted to add a video? Any pointers on how
To


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you're going to have to check the clamp or under it perhaps
 

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Discussion Starter · #17 ·
Clamp looked fine, bolt & nut was a bit battered, so replaced that… to no joy.. when cold you can’t move it at all, only movement when it’s hot..


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Discussion Starter · #19 ·
Where would I find the Turbo Vacuum solenoid? Can’t find a uk image?

Also where does the vacuum pipe that comes of Turbo actuator go to??


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Discussion Starter · #20 ·

Re con Turbo going in… got everything crossed, it does the trick


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So re con turbo didn’t fix the boost issue, swapped out the boost solenoid & actuator pipe, got read of the main message, but was present with a new message around the Blow Off Valve ( same symptoms, no boost)..

Replaced it with the one off my old turbo & so far the issue has gone away… got everything crossed


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