Review on Bosch Automotive 80028/0250202022 Duraterm Glow Plug: Superior Performance and Durability for Efficient Ignition by Neil Biondo

Just put them in my '01 Jetta TDI and they work great! My check engine light was on and the store wanted to charge me $130 for the connectors, $135 for a new wiring harness (which they say always needs to be replaced because the contacts oxidize and give out the CEL code anyway) and $200 for the labor. Instead, I bought 4 plugs here for less than 50€, installed them myself in 15 minutes and sprayed the contacts with contact cleaner (Deoxit 5 or similar). Let it dry for a few hours before reattaching and you're done! PS You still need to delete the CEL code as it is persistent. I have a Bluetooth OBD2 device that you can buy here for <$25 and use my smartphone with the Torque app to erase it. Or you pay your mechanic $20.