This used DENSO alternator (27060-0Q021) is a practical and cost-efficient replacement for small city cars from the Citroën/Peugeot/Toyota family. Ideal for professional mechanics and experienced DIYers, this unit is often searched by its part numbers (27060-0Q021, 5702J2, 5702L1, 5705KJ, 5705NP) and fits directly into the OE mounting and electrical interfaces used on these models. As a used component, it offers original-equipment fitment while helping reduce parts cost compared to new units.

Technical Information

• Manufacturer: DENSO / Stellantis (Citroën, Peugeot)
• Model: Citroën C1, Peugeot 107, Toyota Aygo (commonly fitted on first‑generation models)
• Product Codes: 27060-0Q021, 5702J2, 5702L1, 5705KJ, 5705NP
• Other Numbers: Stellantis / Citroën / Peugeot references as listed above

Fitment And Function

This alternator is a direct-replacement unit designed to restore the vehicle charging system to factory specification. It supplies electrical power to the vehicle while the engine is running and charges the battery. The unit connects to the vehicle via the original mounting points and electrical plugs used on Citroën C1, Peugeot 107 and Toyota Aygo models.

Common Failure Modes — Why This Part Usually Fails

• Worn Bearings: Bearings wear over time and produce noise or mechanical resistance.
• Brush And Slip Ring Wear: Carbon brushes degrade, reducing electrical contact and output.
• Voltage Regulator/Diode Pack Failure: Electrical components can fail from heat or age, causing under- or over-charging.
• Contamination Or Oil Ingress: Engine oil or coolant leaks can damage the alternator internals.
• Belt/Drive Issues: A slipping or broken drive belt prevents the alternator from turning at the required speed.

Installation Recommendations

• Safety First: Always disconnect the negative battery terminal before starting work.
• Inspect Related Components: Check the condition and tension of the drive belt, idlers and tensioner; replace if worn.
• Clean Connections: Ensure the electrical connectors and battery terminals are clean and corrosion-free before re-assembly.
• Torque And Alignment: Tighten mounting bolts to manufacturer torque specifications and confirm pulley alignment to avoid belt wear.
• Check Charging Output After Fitment: With the engine running, measure system voltage at the battery; expected charging voltage is typically between 13.8 V and 14.6 V.
• Cosmetic Condition: As a used unit, the alternator may show signs of wear; verify correct fit and plug orientation prior to final installation.

How To Replace — Basic Procedure

1. Disconnect the negative battery terminal.
2. Relieve tension and remove the drive belt from the alternator pulley.
3. Disconnect the electrical connectors and unplug the battery/field lead.
4. Remove mounting bolts and extract the alternator from the engine bay.
5. Install the replacement alternator, secure mounting bolts and reconnect electrical plugs.
6. Refit the drive belt, set correct tension and reconnect the battery.
7. Start the engine and confirm charging system operation (measure voltage/load test as required).

Note: This is a used original-equipment alternator. Verify that the part numbers match your vehicle’s requirement before installation. For best results, perform a full charging system check (battery, cables, starter draw) when replacing the alternator.

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.

Overview

High-quality replacement alternator suitable for common small city cars from the PSA family and Toyota Aygo. Built by DENSO to OEM fitment specifications, this unit restores the vehicle’s charging system, ensuring reliable battery charging and stable electrical supply for engine management and accessories. The part is often searched by its product code 27060-0Q130, which makes this listing ideal for professional mechanics and DIY enthusiasts looking for a direct-fit used alternator.

Function And Benefits

• Provides stable charging to the 12V battery and supplies current to all vehicle electrical systems while the engine is running.
• Reduces risk of electrical faults, starting problems and unexpected stalling related to low battery voltage.
• Direct-fit replacement that keeps original mountings and connectors for straightforward installation on compatible models.

Compatibility And Fitment

Compatible With Citroën C1, Peugeot 107 And Toyota Aygo models that use the DENSO 27060-0Q130 unit. Always match the product codes listed in the Technical Information to your vehicle’s original part number before installation.

Symptoms Of A Failing Alternator

• Battery warning light or charge indicator illuminated on the dashboard.
• Dimmed or fluctuating headlights and interior lighting, especially at idle.
• Difficulty starting the engine or repeated jump starts required.
• Unusual whining or grinding noises from the alternator area caused by worn bearings.
• Burning smells or visible smoke in severe electrical fault cases.

Replacement Procedure (Summary)

Replacement should be performed by a competent technician or an experienced DIYer with basic tools. Typical steps:

• Disconnect the negative battery terminal before starting work.
• Release drive belt tensioner and remove the accessory belt from the alternator pulley.
• Disconnect electrical connectors and the battery charging cable from the alternator.
• Unbolt the alternator from its mounting brackets and remove the unit.
• Install the replacement alternator in reverse order, ensuring correct alignment and torque of mounting bolts and proper belt tension.
• Reconnect the battery and verify charging system operation with a voltmeter; charging voltage should typically be around 13.5–14.8 V with engine running.

Technical Information

• Manufacturer: DENSO
• Model: Citroën C1, Peugeot 107, Toyota Aygo
• Product Codes: 27060-0Q130
• Additional Numbers: 5702J2, 5702L1, 5705KJ, 5705NP

Installation Recommendations

• Always Disconnect The Battery Before Removing The Alternator To Prevent Short Circuits And Damage.
• Check Drive Belt Condition And Tension; A Worn Or Loose Belt Causes Slipping And Reduced Charging Output.
• Inspect Electrical Connectors And Clean Corrosion Before Reassembly To Ensure Good Contact.
• After Installation, Measure Charging Voltage And System Current To Confirm Proper Operation.
• If The Vehicle Has Enhanced Security Or Immobiliser Features, Follow Manufacturer Procedures To Avoid Lockouts.

Most Common Reason For Failure

Alternator failure is most often caused by internal wear of brushes and bearings, regulator malfunctions, or contamination from oil and water ingress. Excessive electrical load, poor battery condition, or a slipping accessory belt can accelerate wear. Regular visual inspection and maintenance of the charging system help prevent unexpected failures.

Notes For Buyers

This Is A Used Unit. Ensure The Product Codes Match Your Vehicle’s Original Part Number. The alternator is supplied as described and is a cost-effective replacement option for mechanics and knowledgeable DIYers seeking direct-fit parts for Citroën C1 and Peugeot 107 models.

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