Facet Ignition Knock (Detonation) Sensor | 0031538628

Mercedes E320, SL500, ML350, S500, ML320, C280, E55 AMG, E500, CLK320, S430 & more
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P/N: 0031538628 Facet
Description:
PERMANENT NLA
Cross References:
  • 93135

Knock sensors monitor the pre-detonation of the air-fuel mixture in an internal combustion engine. Pre-detonation occurs when part of the air-fuel mixture ignites before normal combustion creating a shockwave that resonates through the engine block that emits an audible knocking or pining sound. When the knock sensor detects the knock or ping, it relays that information to the engine computer so the computer can adjust engine timing and the amount of fuel entering the engine to stop the pre-detonation. Prolonged pre-detonation in one or more cylinders can damage the cylinder walls, pistons, cylinder head gasket, cylinder head, spark plugs, and engine valves.

When a knock sensor detects engine knock for a prolonged timeframe, the engine computer in your Mercedes will illuminate the check engine light with a fault code indicating excessive engine knocking that can not be stopped by adjusting timing and fuel entering the engine. Excessive engine pressure due to carbon build-up in a cylinder, excessive engine load, an improperly timed engine, and lower than recommended octane fuel can all cause excessive knocking that the engine computer can not adjust for.

Replacing Your Mercedes Knock Sensor

Knock sensors are mounted directly to the exterior of the engine block to pick up the vibrations created by pre-detonation. However, due to their location, they can often be challenging to access and may require extensive removal of components such as intake or exhaust manifolds to replace. With that in mind, on average, knock sensors can take between 20 minutes to up to four hours to replace.

View more Mercedes Knock Sensors.

Left = Driver side and Right = Passenger side.
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What This Facet Ignition Knock (Detonation) Sensor Fits?

Application information below is for reference only and should not be used to determine the exact vehicle fitment. Please use the "Make Sure It Fits" vehicle selection box above to determine the exact fitment and review any application notes. If you need any help determining if this part works with your vehicle, please don't hesitate to contact us.

Mercedes
01-05 - C240 Base, 4Matic
98-00 - C280
02-04 - C32 AMG
01-05 - C320 Base, 4Matic
98-00 - C43 AMG
05-06 - C55 AMG
98-06 - CL500
01-06 - CL55 AMG
98-14 - CL600
05-14 - CL65 AMG
98-05 - CLK320
99-03 - CLK430
03-06 - CLK500
01-06 - CLK55 AMG
06-06 - CLS500
06-06 - CLS55 AMG
98-05 - E320 Base, 4Matic
97-97 - E420
98-02 - E430 Base, 4Matic