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While driving my picasso on thursday the engine fault light came on, had a message on the dash and briefly lost power. I drove it home, about a couple of miles and though the engine fault light stayed on, it was driving as normal. So it went in to my local french car car repair centre on thursday. It was fixed and the invoice shows this:

Connected to diag, found several faults stored, checked parameters, found air flow too high, checked vacuum supply to egr valve, found very little vacuum supply, tested vacuum pump tested all ok, suspect blockage in vacuum pipe, unblocked vacuum pipe, cleared faults tested vehicle all ok at time of test customer to monitor.

At the tailend of a 300 mile round trip yesterday the light came on again. I lost power for a few minutes, wouldn't go above 65mph, after that it drove fine for the last 15ish miles to get home with the light still on the dash. I've bought myself a diagnostic tool off ebay so I can read the codes myself, but can anyone advise me the likely part to replace, egr or vacuum pipe? How could the air flow be high?

When the computer requests the EGR to open it expects less air to be drawn in through the MAF because the engine is drawing in the re-cycled exhaust gas instead of air. This is the case for everyone who's blanked/disabled their EGR, but obviously it doesn't cause a fault code tantrum. That's why I'm inclined to think that the EGR is a red herring.

The other obvious possibility is that the MAF is reporting duff values, and IIRC MAF problems definitely do cause tantrums.

Thanks! Well, I can certainly have a crack at replacing the maf, found some on ebay for £30 with a years guarantee. Am I right in thinking its the first part of the induction system, the bit thats jubilee clipped onto the airbox lid?

Used my code reader for the first time just now! Came up with P0341 which is something to do with the camshaft position sensor, P0401 which is egr flow insufficient and P3007 which is air flow signal flow too low. So I definitely will be buying a new maf to try out! Is it worth getting the egr valve blanked as well, thought that would save me some more hassle in the future!

From the list of doom:

P0341 Camshaft Position Sensor A Circuit Range/Performance (Bank 1 or Single Sensor)
P0401 Exhaust Gas Recirculation Flow Insufficient Detected

and I can't find P3007.

As above, I'd be surprised if the EGR one caused a tantrum, but my feeling is that the other two would...

this is a ref page hear it is for the p3007

http://wiki.ross-tech.com/wiki/index.ph ... 007/012295

I've bought one of these today:

http://www.ebay.co.uk/itm/CITROEN-XANTI ... 25815a6290

Hopefully that will fix it. Been googling a lot about EGR blanking too so will probably give that a go in the future.

And I fitted it Saturday! Looks a bit different from the old one, has a flange mount on it so it could fit xantias too, but it fitted fine. I've driven the car about 50 miles at the weekend and the light hasn't come back on! But having used my code reader it still brings up P0341, the camshaft position sensor and I'm sure the car the feels a bit sluggish, like the turbo is taking longer to spool up when I change gear. Anything else I should be looking for? Pretty cramped in the engine bay, thought I could try unplugging or blocking up the pipes for the egr, thought I could also clean the old maf and refit it and see if that makes any difference. Would the camshaft sensor make it feel sluggish?

i would get a cam shaft sensor as that's what the code that keep coming back is for.

with any car fi your reading the codes with anything apart from the genuine manufacturers fault code reader ( in this case peugeot planet) you will always get "fake" codes that show up.