This DENSO alternator (OE reference 27060-0Q020) is a direct-fit charging unit for small city cars Citroën C1 and Peugeot 107, also found on Toyota Aygo models sharing the same platform. Designed for mechanics and DIY enthusiasts, the unit restores reliable charging performance, charges the battery during driving and powers the vehicle electrical system. Many customers search by part numbers such as 27060-0Q020 or manufacturer reference codes, so the correct code listing below helps you find the right replacement quickly.

Technical Information

• Manufacturer: DENSO
• Model: Alternator for Citroën C1 / Peugeot 107 / Toyota Aygo
• Product Codes: 27060-0Q020
• Additional Numbers: 5702J2, 5702L1, 5705KJ, 5705NP

Compatibility And Notes

Fits vehicles built on the shared Citroën/Peugeot/Toyota platform where the mounting, electrical connector and pulley arrangement match the listed codes. Always compare the physical connector, bracket positions and pulley type with the unit being replaced.

Installation Recommendations

• Disconnect the negative battery terminal before starting work to avoid short circuits and protect vehicle electronics.
• Loosen the drive belt tensioner and remove the drive belt from the alternator pulley. Note belt routing before removal.
• Disconnect electrical connectors and the battery lead from the alternator. Remove mounting bolts and extract the alternator from the engine bay.
• Install the replacement alternator in reverse order: bolt to the correct torque, reconnect electrical terminals, refit the drive belt and restore proper belt tension.
• After installation, reconnect the battery and verify charging system operation with a multimeter: typical charging voltage should read approximately 13.5–14.8 V with engine running.
• Ensure pulleys are aligned and belt condition is good. Replace the drive belt if glazed or worn.
• When tightening fasteners, follow torque values recommended by the vehicle manufacturer to avoid damage.

Why This Part Commonly Fails

Alternators are subject to mechanical and electrical wear. Typical failure causes include:

• Worn Brushes And Slip Rings: Over time brushes wear down and contact degrades, reducing output.
• Faulty Diode Rectifier Or Voltage Regulator: Diode or regulator failure causes poor charging, battery drain or overcharging.
• Worn Bearings Or Noisy Pulley: Bearings fail due to age or contaminant ingress, producing noise and eventual seizure.
• Contamination And Corrosion: Oil, coolant leaks or road salt can damage internals and electrical connections.
• Belt Slip Or Incorrect Tension: A slipping or worn belt reduces alternator speed and charging efficiency.

Symptoms of a failing alternator include battery warning lamp illumination, dimming lights, weak battery, frequent jump starts or unusual noises from the alternator area. Typical service life varies with use and environment but alternators commonly show wear after 100,000–200,000 km.

Additional Advice For Professionals And DIYers

When fitting a used alternator, check the output under load and inspect the pulley, connector and mounting for any signs of damage. If repeated alternator failures occur, verify the vehicle electrical system (battery condition, earth connections, belt drive and vehicle electronics) to avoid premature replacement.

The Citroën C1 and Peugeot 107 are mini cars that were produced from 2005 to 2022.

The production of the Citroën C1 and Peugeot 107 first series took place between 06/2005 – 02/2009; the first facelift from 02/2009 – 2012, and the second facelift from 2012 – 2014.
The second series was produced from 2014 – 2022.

When placing an order, you have the option to provide your VIN number, and we will check the part’s compatibility with your vehicle.

How to Replace the Engine Control Unit?

The unit is located on three screws to the left behind the engine and can be easily diagnosed and transferred to another vehicle.

Manufacturer: BOSCH

Robert Bosch GmbH operates in four business sectors: mobility (hardware and software), consumer goods (including home appliances and power tools), industrial technology, and energy and building technology.

Additional Codes
27060-0Q020 27060-0Q021 27060-0Q130 5702J2 5702L1 5705KJ 5705NP

Technical Information

• Manufacturer: Bosch
• Model: Citroën C1, Peugeot 107
• Product Codes: 0261208702, 89661-0H023
• Additional Numbers: 27060-0Q020, 27060-0Q021, 27060-0Q130, 5702J2, 5702L1, 5705KJ, 5705NP