Ace what do you think stops any codes recurring is is the blanking plate under the EGR valve ?.
I wasn't having any EGR issues before I started, and I didn't have a DPF warning light on either.
If you block off the EGR completely you will defnitely get a fault, although on mine the car doesn't go into limp mode at that point. I suppose I could drive it like that, but I wouldn't know if I had another fault indicator appear because the EGR fault might take precedence. I haven't tried it though.....I'm now wondering if fault codes 'stack' and then the display cycles through them.
It would probably play havoc with me seeing which tune was playing on Blue & Me so I'll probably not bother blocking it completely
The restrictor lets just enough exhaust gas back into the system for the ECU to recognise that it isn't blocked. It's a good halfway house between having an all original system or having it deleted and remaped.
Going down to my mates garage this morning to work on the car, feel more confident not I have the Diagnostic programs just hope its nothing expensive as I forked out £600 last month on the wife's car and still recouping from that one.
The important figure for you will be the 'differentiual pressure sensor' (DPS) If you're using MultiECUScan software it's on tab 4, I think called 'parameters'. Scroll down the list of parameters and you'll find the DPS, click on the box to the side of it and while the engine is running make a note of the pressure sensor output, measured in mbar.
Check it at 2000rpm,2500rpm and 3000rpm and make a note of it and post the values here, or compare to the values mentioned in earlier posts. That will tell you very quickly if there's a problem.
With the ignition on but the engine OFF the DPS output ought to be zero, or close to zero (or even a negative value close to zero) if it doesn't go close to zero with the engine off then the sensor is possibly faulty.
I think a dignostic tool is the first accessory which everyone should buy for their car. For the cost of the interface and as long as you have a laptop or other suitabe mobile device you get to learn so much about the condition of the engine.
It would be worth taking them along to any potential purchase too - the ECU tells you how many times the oil service light has been reset, you can pick up any fault codes, watch the data from the injectors to see if they're working correctly. You might be able to do some bargaining when you show the owner any issues, on the screen.
With the interface you can also plug into other cars, I can look at my wife's Mini, and check for clues if it gets a problem too. There might be a million google hits for a particular fault code on that car and the fix could be very simple. It can potentially save you a fortune