Your Audi TT, with the 1.8-liter engine and front wheel drive came equipped with NGK 6458 Double Platinum Spark Plugs. If you look for them in parts stores, you may find them as 6458 PFR6Q Laser Platinum plugs, but if you can't find that exact plug, what do you do? If you presume a manufacturer knows the best products to make its vehicles work, then it follows that the original equipment manufacturer's choices were the best. Spark plugs manufacturers, however, want to ensure they can work effectively in as many cars as possible, meaning there's often more than one spark plug that will work well in your car.
There are, in fact, 11 spark plugs that you can substitute effectively. These include the Autolite APP3923, the Beru 14F-6DPUR02 or the Bosch F7DPP222T. You can also use the Champion OE136, the Daihatsu 9004851166000 or the Denso PK20PRP8. The Eyquem RFC58LZDP, Fiat 60569957, Mitsubishi MS851346 and Unipart GSP9652 also effectively substitute for the NGK plug. Finally, you can use the Motorcraft AGPR12PP8 to keep your Audi TT running efficiently.
