CEL in a gasser is much less an issue that our diesels.
THE CEL WAS ON INDICATING THE GLOWPLUG(S) OR GLOWPLUG SYSTEM HAD FAILED.
THE GLOWPLUG SYSTEM IS AN INTEGRAL PART OF THE EMISSIONS SYSTEM AND THE DPF FUNCTION/REGENERATION.
He was misinformed or ignorant.
Dude, are you serious? an "integral part of the emissions system", really? Its a cold start aid and doesn't have anything to do with the DPF or anything part of the engine after its running.
DPF is the one of the dumbest ideas dreamed up yet. This is how I think that started...
"Hey, I know, we'll capture all the particulates in the exhaust to keep them out of the environment"
"Wow thats brilliant, but what do we do with all the crap when this capture device is full?"
"Hmmm, well lets dump raw diesel in the exhaust while the engine is running to burn it out of there"
"Right...but if we're going to just burn it out of there, why did we bother capturing it in the first place?"
"Oh it will only work a few times, then the device will have to be replaced with a new one"
"Hmmm, so let me get this straight, we're going to invent a device that captures particulates in the exhaust, sort of self cleaning by burning it out, no doubt very expensive to replace, and ensures lower fuel economy, lower performance, and higher maintainence costs, its great!"
Yeah, thats brilliant guys.
There is NO argument that DPF deletes yield better power, and better fuel economy. Why isn't improving fuel economy priority 1? If we reduce the amount of fuel we consume, demand goes down, foreign dependancy on oil goes down, prices go down, operating costs go down and less fuel is burned, thus less emissions. DPFs arent for the environment, they are for beaurocrats and big oil. And don't get me started on EGR valves!
"Hey lets reduce emissions by recirculating exhaust back in the intake"
"Wow that will very effectively reduce exhaust volume... but won't the exaust be harmful to the engine? Kind of like cuffing a fart and inhaling it to make is stink less?"