NGK Laser Platinum Spark Plug PFR6X-11 for Audi A4 Quattro, A5 Quattro, A6, Q5, and S5 (2008–2012)

The NGK 5757 Laser Platinum spark plug, NGK designation PFR6X-11, is a platinum-center-electrode plug for the Audi A4 Quattro, A5 Quattro, A6, Q5, and S5. It has an M14 x 1.25 thread with a 19 mm thread length and installs with a 16 mm spanner. The platinum center electrode works with a single ground electrode, and the spark position sits 3.5 mm out from the seat. A 1 kOhm internal resistor provides interference suppression, which keeps ignition noise out of the vehicle's electronics. The plug seals on a gasket seat and has a fixed SAE terminal, so there is no removable top nut to back off or tighten. NGK makes this plug in Japan.

This spark plug carries a 24-month, 24,000-mile warranty.

The 5757 cross-references to Audi part numbers 101905611A and 101905631F. Either number on your old plug or in an Audi parts lookup is a good sign this is the right plug. Audi uses different plugs across its engines, and two plugs with the same M14 thread can still differ in thread length, resistor value, or electrode material, so compare the PFR6X-11 code and the 19 mm thread length against the plug you remove. A spark plug carries high voltage from the ignition coil across its gap to light the air-fuel charge in the cylinder, so a worn plug shows up quickly in how the engine runs.

Technical Details

• Manufacturer: NGK, a brand of Niterra Co., Ltd. of Nagoya, Japan
• NGK part number: 5757
• NGK designation: Laser Platinum PFR6X-11
• Thread: M14 x 1.25, 19 mm thread length
• Spanner size: 16 mm
• Electrodes: platinum center electrode, one ground electrode
• Interference suppression: 1 kOhm resistor
• Spark position: 3.5 mm
• Seat and terminal: gasket seat, fixed SAE connector
• Cross-references: Audi 101905611A and 101905631F
• Made in Japan
• Warranty: 24 months or 24,000 miles

Common Questions

What symptoms point to worn spark plugs?
Misfiring, a check engine light, hesitation, loss of power, and poor fuel economy are the common signs of plugs past their service life.

Does this plug seal with a gasket or a tapered seat?
It uses a gasket seat.

Which Audi part numbers does this plug match?
It cross-references to Audi 101905611A and 101905631F.

PMB Performance sells NGK ignition parts for European cars, backed by more than 20 years of parts experience.

Fitment & Compatibility

Check the fitment table below for the Audi models and years this plug fits. Send us your VIN and we will confirm the fit before you order.