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Clio Limp mode p0120 172 turbo

Sparkysparks

Well-Known Member
Hi all.
So I've sold the last of my Renaults! Well taken a deposit on the Clio turbo...and now it decides to start playing up.
I need some help here cus I'm at a loss, considering either just giving it away for cheap or keeping it altogether and forgetting about it again (problem is I've already bought it's replacement and I really shouldn't have)

PXL_20250203_105839114.webp

Getting limp mode p0120 after a little rev.
With the eml coming on and the heartbeat box.
I've gone through the fuse box wiring connectors and cleaned them all up, didn't seem that bad but it's starting and running easier now.
It idles like with a miss fire but revs cleanly, untill it hits the limp mode.

I read somewhere that the fuel pump can be throwing up this code, so I pulled that out and found my submersible fuel hose had deteriorated, swapped that out but still it runs the same.
PXL_20250204_102234540.webp

Throttle body doesn't seem to do much on ignition unless I put the pedal to the floor, then it just cracks open a little bit.

Ice tried a second throttle pedal and it changes nothing.

Wiring to the pedal is shared with the brake and clutch switch. Interestingly if I unplug them then the throttle is unresponsive completely.
If I unplug everything and run it, idle either sits at 3k or hunts around 500.

Car looks spot on and ice already massively discounted the price.
What do I need to check now?
I don't have access to clip and I can't take the car anywhere.
Any ideas atall would be appreciated.
Cheers
 
Cleaned up the plugs. Cleaned up the HT leads and blasted them through with contact cleaner and the air compressor.

Yes rising fuel rate. I've just got the 1 hose from regulator to the inlet manifold, with a tee off for boost gauge. It was fresh silicone when it went on but I'll give that a look over too.
Will check injector resistance and get some fuel and go from there again. Cheers
 
Have just let it warm up. It suddenly just started running lovely. No miss in touching the throttle. Then I took it up the road and felt boost for the first time in a long time. I think it just needed some fresh fuel. It still needs more as it was cutting around corners. But I think it's cured!
 
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