大众途锐/奥迪Q7/斯柯达 101905621B 铱金火花塞 PFR6W-7G 原厂替换

If your vehicle shows unstable idle, weak acceleration, rising fuel consumption, or cold-start difficulty, spark plug electrodes are severely aged; ignition energy is insufficient. This spark plug provides precise ignition to ensure smooth power and combustion; OEM replacement with numbers 101905621B / PFR6W-7G; fits VW Tiguan, Audi Q7 and some Skoda models post-2000. Install with torque wrench to spec; ensure spark plug threads and cylinder head threads are clean to avoid damage from over-tightening or under-tightening; verify high-tension leads are secure.