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VDO Ignition Knock (Detonation) Sensor | 0031538928

Mercedes E320, C230, 300E, C280, SLK230, S320, 300CE, SL320, 300TE, C220 & more
$40.99
Reg
$42.70
List
$66.56
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Make Sure It Fits

P/N: 0031538928 VDO OEM FREE SHIPPING
Cross References:
  • 80233012076
  • A0031538928
  • S103995001Z
  • W01331617102

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.
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 VDO 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
93-93 - 300CE
For models with 104.992 engine from serial number 072237, please verify existing sensor number prior to ordering.
93-93 - 300E 4Matic
104.942 From 048697; Transmission Control Type: Automatic
93-93 - 300E 2.8
For models with 104.942 engine from serial number 048697, please verify existing sensor number prior to ordering.
93-93 - 300E
For models with 104.992 engine from serial number 072237, please verify existing sensor number prior to ordering.
93-93 - 300TE
For models with 104.992 engine from serial number 072237, please verify existing sensor number prior to ordering.
96-96 - C220
Please verify existing sensor number prior to ordering.
99-99 - C230 Kompressor
97-00 - C230
Please verify existing sensor number prior to ordering.
94-94 - C280
For models with 104.941 engine from serial number 042152, please verify existing sensor number prior to ordering.
95-97 - C280
Please verify existing sensor number prior to ordering.
95-95 - C36
For models with 104.941 engine from serial number 042152, please verify existing sensor number prior to ordering.
96-96 - C36
Please verify existing sensor number prior to ordering.
97-97 - C36 AMG
Please verify existing sensor number prior to ordering.
94-94 - E320
For models with 104.992 engine from serial number 072237, please verify existing sensor number prior to ordering.
95-97 - E320
Please verify existing sensor number prior to ordering.
94-94 - S320
For models with 104.994 engine from serial number 036701, please verify existing sensor number prior to ordering.
95-99 - S320
Please verify existing sensor number prior to ordering.
94-94 - SL320
For models with 104.991 engine from serial number 011342, please verify existing sensor number prior to ordering.
95-97 - SL320
Please verify existing sensor number prior to ordering.
98-00 - SLK230 Kompressor
Please verify existing sensor number prior to ordering.