Bosch 04170 Ignition Rotor - VW Golf, Jetta, Audi 80/90, Volvo 240

Bosch Ignition Rotor – 04170

The Bosch 04170 is a high-performance ignition rotor designed for modern-classic European and select import vehicles. As a core component of the distributor system, this rotor transfers high-voltage current from the ignition coil to the individual spark plug terminals. Engineered specifically for electronic ignition systems, the 04170 ensures precise timing and a strong, consistent spark necessary for maintaining fuel efficiency and engine power.

Constructed with a heavy-duty brass contact tip, this rotor offers superior electrical flow and resistance to the "arc-erosion" that typically wears down cheaper aluminum components. It features an integrated resistor to suppress radio frequency interference (RFI), protecting sensitive engine sensors and onboard electronics from electrical noise.

Detailed Vehicle Compatibility

Audi 4000:

• 1985, 1986, 1987

Audi 80 / 80 Quattro:

• 1988, 1989, 1990, 1991, 1992

Audi 90 / 90 Quattro:

• 1988, 1989, 1990, 1991

Hyundai Scoupe:

• 1993, 1994

VW Cabrio:

• 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002

VW Cabriolet:

• 1990, 1991, 1992, 1993

VW Corrado:

• 1990, 1991, 1992

VW EuroVan:

• 1992, 1993, 1994, 1995, 1996

VW Fox:

• 1991, 1992, 1993

VW Golf:

• 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999

VW Jetta:

• 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999

VW Passat:

• 1990, 1991, 1992, 1993, 1994, 1995, 1996

VW Scirocco:

• 1986, 1987, 1988

VW Vanagon:

• 1986, 1987, 1988, 1989, 1990, 1991

Volvo 240 / 244 / 245:

• 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993

Volvo 940:

• 1995

Product Highlights & Features

• Brass Contact Surface: Delivers maximum energy to the spark plugs while resisting the pitting and corrosion that leads to ignition failure.

• Precision Dielectric Housing: Prevents high-voltage "leakage" to the distributor shaft, ensuring the spark goes exactly where it is intended.

• RFI Suppression Resistor: Prevents electrical interference with the vehicle's ECU, radio, and other sensitive digital components.

• OEM Fit and Quality: Manufactured by Bosch to meet the exact tolerances required for the widely used 2.0L ABA and Volvo B230 engines.

Technical Specifications

• Part Number: 04170

• Interchange: 052-905-225C

• Resistor Value: 1k Ohm

• Compatibility: Electronic Ignition Distributors

Installation & Maintenance Tips

• Alignment is Key: Ensure the internal notch on the rotor is perfectly lined up with the groove on the distributor shaft. Press down firmly until seated; a loose rotor can destroy the distributor cap.

• Check the Cap: When replacing the rotor, always inspect the distributor cap terminals for heavy oxidation. Replacing both as a set is recommended for peak performance.

• Moisture Inspection: If you experience misfires in damp weather, check the rotor for "carbon tracking"—tiny black lines on the body that indicate current is leaking to ground.

• Service Interval: For high-mileage daily drivers, inspect the rotor every 30,000 miles to ensure the brass tip hasn't thinned out.