Ali, my mate has told me about the Wolverhampton place so I'm ringing them tomorrow along with your Nuneaton link (that's handy but looks like MX5 specialist).
These Mazda 6s are great cars but like most they have inherent problems. The cam chain is a weakness which surprised me - I'd rather have a chain than a belt.
If the car didn't have warning lights you would drive it unaware of any issues. It goes like stink and is very economic! However there is a DPF light shouting at you and the dreaed engine symbol! Thank god 240Zs don't have them!
I'm convinced the DPF is a bum-steer and just related to service/oil intervals etc On Friday I had a guy do a diagnostic check. He found the DPF issues but also cam/crank sync issues which points to cam-chain wear. OK it is a known problem so we now have a positive diagnosis.
He ran a forced Regeneration cycle for 30 mins which in theory clears the DPF. The heat from the exhaust was fightening.
Anyway that didn't clear the DPF light but there are solutions on the internet on how to do this - ground a 'pin' and press the acc pedal 10 times. Modern cars
So do we run the car and pray or change the cam-chain. We change the cam chain but close to £1000 is a big hit - they don't mention this in the sales-rooms do they!
The dealer wants £75 plus vat to re-diagnose the problem which is robbery! I've said if they diagnose it and it says the cam-chain is ok fine we'll pay the £75 plus vat. If they come back and say yes you were right it does need changing then I'm not happy paying.
I've also fitted a new boot-release switch which seized up. A known problem and now updated - £50 a switch!