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Genuine Mercedes Ignition Knock (Detonation) Sensor | 2709050900

Mercedes CLA250, C63 AMG, GLA250, E63 AMG S, S63 AMG, G63 AMG, G550, C63 AMG S, S560, CLA45 AMG & more
$17.19
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$17.91
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$22.50
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Make Sure It Fits

P/N: 2709050900 Genuine Mercedes
Cross References:
  • 2709050200
  • A2709050900

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.

Any Genuine brand part is obtained directly through our vehicle dealership network from your vehicle's manufacturer. This is always your best option for getting the exact same part that is being replaced and will be the latest version design.
Left = Driver side and Right = Passenger side.
All parts are priced individually unless identified as a set or kit. "Per car" notes identify how many of a given part your car has and "Left/Right or Front/Rear" notes means the part fits the left or right side of the car. These parts are still sold individually and you'll need to select the appropriate quantity if you plan to replace more than one of this item.

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What This Genuine Mercedes 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
17-21 - AMG GT
Right
19-21 - AMG GT 63
Right
19-21 - AMG GT 63 S
Right
18-21 - AMG GT C
Right
18-20 - AMG GT R
Right
20-20 - AMG GT R Pro
Right
16-19 - AMG GT S
Right
16-21 - C63 AMG
Right
15-21 - C63 AMG S
Right
14-19 - CLA250 Base, 4Matic
Left ~ Not for cars with (Code 184).
14-22 - CLA45 AMG 4Matic
18-21 - E63 AMG S 4Matic
Right
16-21 - G550
Right
17-18 - G550 4x4
Right
19-21 - G63 AMG
Right
15-20 - GLA250 Base, 4Matic
Left ~ Not for cars with (Code 184).
15-22 - GLA45 AMG 4Matic
18-21 - GLC63 AMG 4Matic
Right
18-21 - GLC63 AMG S 4Matic
Right