Megane 3(1.5 DCI) P0002 & P1525 codes

martyc5674 · 26-05-2026 08:38PM #1

Had these pop up the other day, car is running perfect, no power loss that I’ve noticed etc, I have noticed an ever so slight turbo whistle when changing up gears recently so maybe related. P0002 refers to a fuel regulator and some suggestions online relate to fuel starvation, I’m thinking of changing the fuel filter the weekend anyway.

The codes popped up as I was climbing a steepish hill in 5th gear, and I was able to replicate it since by trying to accelerate on a steep incline. (In 5th gear 90kmh and hit the throttle)

Any ideas or wisdom welcome.

TIA

Marty.

BrianD3 · 26-05-2026 09:05PM

https://www.boards.ie/discussion/2058439152/megane-3-1-5-dci-p0002-p1525-codes

One of the few common faults on these cars is the fuel primer bulb - it can burst, develop a pinhole etc. If the hole is big enough, too much air will enter the fuel line and the car won't run. You might get away with a tiny pinhole but perhaps it would result in a fuel supply fault code.

martyc5674 · 26-05-2026 09:30PM

Interesting you say that- a few years ago that bulb developed a very tiny leak - resulted in hard starting until I sealed it, it was weaping diesel at the time(it’s not now but I’ll keep an eye on it)

Edit- I just gave the bulb a few squeezes and it did indeed leak- could be the issue.
have you replaced them?- I see ridiculous prices for them on Renault- hopefully motorfactors has a kit.

blue5000 · 27-05-2026 12:24AM

https://www.boards.ie/discussion/comment/124502110#Comment_124502110

They are about €140 if I remember correctly. Spurious ones can be troublesome. If you plan on keeping the car long term, for peace of mind you might be better off getting the genuine one.

BrianD3 · 27-05-2026 09:41AM

https://www.boards.ie/discussion/comment/124502110#Comment_124502110

My bulb burst when it was at the main dealer getting the fuel filter replaced. They replaced it with a generic bulb, hoses and jubilee clips instead of a genuine part - probably because they were not charging me for it. The hose they used dissolved (it may have been meant for water, Jesus wept) a few months later. Back again for another hose. That one lasted a couple of years before it started to disintegrate. I then replaced it and the bulb myself. The hose is fine but the bulb I got didn't last. A lot of bulbs seem to be poor quality

the moral of the story is - get a proper kit as if you feck around with hoses and bulbs, you may end up with more hassle with a car that is otherwise known for being very reliable and long lasting.

martyc5674 · 27-05-2026 10:40AM

Thanks BrianD - 👌

Megane 3(1.5 DCI) P0002 & P1525 codes

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