I'm experiencing a check engine light on my 2003 VW TDI, with the fault code P0671 appearing. The vehicle runs normally, but I'd like to understand what this code means before taking it to a dealer. Is there a common cause or DIY fix for this issue? Any insights from owners of similar models would be greatly appreciated.
Thanks for clarifying that — it’s helpful to know P0671 specifically relates to glow plug issues in TDI diesels. For a 2003 model, this is common due to aging components. I recommend checking the glow plugs individually and testing their resistance with a multimeter. If one is faulty, replacing it should resolve the code.
For TDI owners, it's important to note that these engines are known for excellent fuel efficiency when maintained properly. Avoid delaying timing belt replacement — it’s an interference engine, and a broken belt can result in catastrophic engine damage. Also, many users report success with converting their TDI to biodiesel as a long-term solution.
I appreciate the technical insight. I plan to take my vehicle to a trusted mechanic rather than attempting repairs myself. The P0671 code is concerning, especially on an older TDI — I’ll look for a certified VW technician with experience in diesel systems.
I’ve had good results with replacing glow plugs and using proper diagnostic tools. For DIYers, a basic OBD2 scanner can help identify the exact issue. If you're not confident, consider visiting a local VW specialist or joining a TDI owner group for shared troubleshooting tips.
As someone who worked on VWs for over 40 years, I’ve seen many of these issues firsthand. The labor cost at dealerships can be high — often $105 per hour with a minimum one-hour diagnostic fee. But the real value lies in proper diagnosis and avoiding unnecessary repairs. If you can't afford to maintain a German-made vehicle, it might not be the right fit for your budget.
A good rule of thumb: if you're considering DIY fixes on a TDI, ensure you have access to proper tools and technical knowledge. Many common issues like P0671 are fixable with basic parts — but misdiagnosis can lead to costly mistakes. Always verify the code before assuming a component failure.
Jeff..you are a true professional...wish you knew VW's and where in my area. I would take advantage of your services...Havent tried bio yet....did get the T-belt changed @ 90k...dealer did it after some negotioations. They did a fine job I might add.
This is one of the reasons why I dumped my Dodge P.O.S. The people at the stealerships were true professionals, just Like Jeff Compton. Dude, get off his a$$ and go play on the freeway.
whoa, good one!
You're Canadian! That explains everything.
proud of it too! You're quite an argumentative one aren't you! What's your issue? Some mechanic beat the stuffing out of you once, was your daddy a mecahnic and he touched you in your naughty place?, Dude read the posts, He has no problem with me, I'm not sure why you do. Maybe you can't access your favouite porn sites or something! If you hate Dodges fine, drive something else, I didn't design it and if you hate mechanics then go GOOGLE a help group or something, Quit wasting our time trying to start something. I'm not the problem with the industry!
Whatever you say, Canuck Boy.
ooh that one hurt!
Dodge Hater wrote: This is one of the reasons why I dumped my Dodge P.O.S. The people at the stealerships were true professionals, just Like Jeff Compton. Dude, get off his a$$ and go play on the freeway. Who in the hell do you think you are? I do not know Jeff personally, but I also take offense to that comment. I work at a dealership also and I have to deal with people like you all the time. You are one of those type of people that have no life. So you go to the first online forum that you find and pick a fight with someone to make yourself feel all big and mighty. I am not the one to fight online, because I have a life, but I am getting tired of seeing people post comments like this. Its like any other industry in that there are people in it that are good and know what they are doing, and there are others that should not even be allowed to touch a wrench.
amen to that!
jeff and b.cash heres another amen men. only i just retired from working on VW's after 42 years i got sick of just what was listed here. spend a hour finding the problem"$95.00 here" and then well i'm going to fix it my self.or get that should be warrenty. sure, tuner, cold air kit, exhaust with no cat or cats, lowered so far you can't slide the lift under it. amen to the techs who fight back
wish i had seen this one sooner. guess i need to come in more offten thanks jeff as this retired VW dealer tech surely would have told him the same thing,if you can't afford to fix a german made car don't buy one. and if you do don't keep it past the warrenty. as to labor rates the shop i was at had it at $105.00 a hour with a 1 hour min. on all diag. work credited to the repair should it be approved to do. ever think of the cost of just turning the key to open the door. start with. electric. gas . heat, insurance. shop supplies and employie labor. out of $105 a hour the shop profit would be 15.00. not shareing information if i did all the time i would not have any work to do each day
Bad post deleted. Thread closed. For obvious reasons, it's lost it's productivity.
P0671 and related codes like P0672-P0674 typically indicate a glow plug fault in VW TDI diesel engines. This is a known issue for older TDI models, especially around the 5-year mark. The code may point to a faulty glow plug, wiring issue, or sensor malfunction. It's worth checking the glow plug resistance and ensuring proper grounding.