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Bosch Ignition Knock (Detonation) Sensor; 520mm with Blue Plug Connector | 0261231036

Audi A4 Quattro, A6 Quattro, A4, S6, A6, 200 Quattro, 90 Quattro, 100, 90, 80 Quattro & more
Porsche 928
VW Jetta, Passat, Golf, Cabrio, Jetta MK3, Golf MK3
In Stock Status
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Leaves warehouse within 1-2 business days.

Make Sure It Fits

P/N: 0261231036 Bosch OEM FREE SHIPPING
520mm with Blue Plug Connector
Please verify appearance and connection on existing sensor prior to ordering - this sensor supercedes multiple units.
Cross References:
  • 0261231031
  • 0261231037
  • 054905377
  • 054905377G
  • 92860614400
  • W01331616751

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 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 Vehicle's 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 Bosch Knock Sensors.

Bosch is the world's largest supplier of components to the automotive industry. The Bosch product line includes alternators & starters, brakes, electronic controls and sensors, fuel system parts and management, ignition system components, and steering system components. All Bosch automotive parts are either OEM (Original Equipment Manufacturer) or made to their specs as a replacement part for the OEM unit.
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.

Proposition 65 Warning WARNING: This product can expose you to chemicals, which are known to the State of California to cause cancer and birth defects or other reproductive harm.  For more information go to

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What This Bosch 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.

90-94 - 100 Base, CS, S
90-94 - 100 Quattro Base, CS, S
91-91 - 200 Quattro 20v
535mm Blue; Cylinder Head Type: DOHC; Valvesper Engine: 20
90-92 - 80
90-92 - 80 Quattro
88-89 - 80 Quattro
535mm Blue
90-95 - 90 Base, CS, S, Sport
88-95 - 90 Quattro Base, 20v, Sport
97-01 - A4 , Base
96-99 - A4 Base, Avant
2 per car.
97-00 - A4 Quattro Base, Avant
96-98 - A4 Quattro Base, Avant
2 per car.
99-99 - A4 Quattro Base, Avant
For models with production date through 4/1999. 2 per car.
98-98 - A6
96-99 - A6
2 per car.
95-95 - A6
For models with production date from 8/1994. 2 per car.
98-98 - A6 Quattro
96-99 - A6 Quattro Base, Avant
2 per car.
95-95 - A6 Quattro
For models with production date from 8/1994. 2 per car.
93-95 - 928 GTS
91-91 - 928 GT, S4
535mm Blue
95-01 - Cabrio
02-02 - Cabrio
535mm Blue
90-99 - Golf Base, Celebration Edition, City, GL, GTI & more
90-92 - Golf GL, GTI 8-Valve
For Federal (non-California) models.
99-99 - Golf MK3 GL
90-98 - Jetta Celebration Edition, City, GL, GLI 16-Valve, GLS & more
90-90 - Jetta Carat
For German made models.
99-99 - Jetta MK3 GL, GLS
96-00 - Passat Base, GLS, Turbo
98-99 - Passat Base, GLS
2 per car.
95-95 - Passat GLS
2.0L 535mm Blue
98-98 - Passat GLS
535mm Blue