Hi Dave

"I offer a repair(new DPF) and not a bi-pass as it's the correct repair to carry out. "

"Who decides what is & what is not a "correct repair" to carry out? "
That would be me

"What constitutes a "correct repair"? "
The manufacturer workshop manuals

"I suppose we should look at what we are trying to achieve when we attempting a repair & what is our goal or motivation? "

Good point , the goal as always is to carry out the correct repair

"Are we trying to offer a cost effective, long term & reliable fix, that will allow the owner to use their car reliably & lawfully for a reasonable period, without the likelihood of repeated & costly problems? Or are we simply trying to "bin" the customer off & draw 500 quid for 20 minutes work? "

Not guilty

"It is only now that we are told that the driver is contravening the law, by deliberately using a modified car. So the previous repair route, offered in good faith, is now deemed to be illegal! Who is the bad guy here? "

The garage that removed the DPF

"Previously I made reference to, what I consider to be an extremely relevant subject & that is the Vauxhall EGR solution that the manufacturer sought fit for mass release. I am sure that there are other instances too! For example, there are many reported rumors (that's screwed my argument lol ) that many Manufacturers have played with the tolerances of their own Cat Efficiency monitors, to widen the goal posts & allow a more relaxed threshold limit"
.
Yes good point but like good politicians they (the manufacturers) could make any figures look good

I look at the new DPF option as i believe its the only way to go as we will are the last to work on the car so we caused the problem!! how many times has that one popped up!

regards
John