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Bosch Ignition Knock (Detonation) Sensor | 030905377C

Audi A4 Quattro, A4, TT Quattro, S6, TT, S8, S7, A3 Sportback e-tron
VW Jetta, Passat, Golf, Beetle, Touareg, CC, Jetta IV, R32, Atlas AWD, Atlas & more
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P/N: 030905377C Bosch
Cross References:
  • 0261231146
  • 95560612510

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.

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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.

16-16 - A3 Sportback e-tron Premium, Premium Plus, Prestige
05-09 - A4 Base, Cabriolet
05-09 - A4 Quattro Base, Avant, Cabriolet
13-18 - S6 Base, Premium Plus, Prestige
Cyl's 1-2, 3-4, 7-8
13-18 - S7 Base, Premium Plus, Prestige
Cyl's 1-2, 3-4, 7-8
13-18 - S8 Base, Plus
Cyl's 1-2, 3-4, 7-8
01-06 - TT
04-09 - TT Quattro
02-06 - TT Quattro
18-20 - Atlas SEL Premium
18-20 - Atlas AWD Launch Edition, S, SE, SEL, SEL R-Line
20-20 - Atlas Cross Sport SEL Premium, SEL Premium R-Line
20-20 - Atlas Cross Sport AWD SE, SE R-Line, SEL, SEL R-Line
20-20 - Atlas Cross Sport FWD SE, SE R-Line, SEL, SEL R-Line
18-20 - Atlas FWD Launch Edition, S, SE, SEL, SEL R-Line
01-01 - Beetle
Left ~ From chassis # 1C-1-400001.
Right ~ From chassis # 1C-1-400001.
98-05 - Beetle Base, Turbo, Turbo S
09-16 - CC 4 Motion, Executive, Executive 4 Motion, Lux, V6 Executive 4Motion & more
01-06 - Golf Base, GTI, GTI 1.8T, GTI GLS
06-06 - Golf IV GL, GLS
04-04 - Jetta
Left ~ Body Type: Sedan
Right ~ Body Type: Sedan
01-03 - Jetta Base, GL
Left ~ Body Type: Sedan
Right ~ Body Type: Sedan
Body Type: Wagon
01-01 - Jetta GLS
Left ~ From chassis # 9M-1-075841. Body Type: Sedan
Right ~ From chassis # 9M-1-075841. Body Type: Sedan
02-04 - Jetta GLS, GLS Turbo
05-05 - Jetta IV Turbo
Left ~ Body Type: Sedan
Left ~ Body Type: Wagon
Right ~ Body Type: Sedan
Right ~ Body Type: Wagon
05-05 - Jetta IV
Left ~ Body Type: Sedan
Right ~ Body Type: Sedan
06-18 - Passat 3.6, GT, SE, SEL Premium, VR6
08-08 - R32
04-06 - Touareg