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velouria posted a topic in Operation and Maintenance: 450 Model, 2005-2006, dieselHello, From what I gather from reading on here, the issue I am currently having with my 2005 Smart could be a clogged CGR valve. I also drive like a granny, all city driving, and haven't been redlining it as suggested to blow it out. This car has sentimental value as I inherited it from my dad and he received his new Smart Car on the day my eldest child was born, in 2004. So she's had a lot of family history, but now I've just put in a thousand dollar struts/spring repair, new battery, and last year new alternator. So she's getting costly, but only has 150000 kms and I would like to see if I could get a few more. My question is, has anyone had any luck with fuel additives, someone suggested Mulligan's diesel fuel conditioner, but I see the company in Canada just filed for receivership. Someone else had luck with biodiesel to clean out the gunk, but I have no clue where I could even buy any in Canada and I'd likely burn down the house making it. The repair posted on here is far out of my realm, as you know these engines are difficult to access, and looks quite involved. It's obviously winter now, the check engine light is intermittently on, then goes into limp mode. When the light is off the power is fine, but has been more on then off lately. I hope this isn't the whole turbo exhaust unit needing fixing, because I would have to scrap her. Anyone have any ideas?