Engine & fuel system
5 documented faults — symptoms, causes and workshop fixes.
Engine cuts out intermittently
Symptoms
Intermittent power loss. Poor cold starting.
Cause
Fuel pressure regulator control solenoid faulty.
Repair
- Fit new fuel pressure regulator control solenoid.
Parts1 part
| Part | Part number | Qty |
|---|---|---|
| Fuel pressure regulator control solenoid (Denso) | 294009-0120 | 1 |
Data: Motorwise Workshop. Bulletin 1.
Diesel particulate filter (DPF) warning lamp flashing
Overview
- Affects
- All models with Diesel particulate filter (DPF).
Cause
Diesel particulate filter (DPF) blocked.
Engine oil contaminated with Diesel fuel.
Repair
- Carry out forced DPF regeneration. Forced DPF regeneration can only be carried out using manufacturer's or equivalent diagnostic equipment.
- Change engine oil and filter.
Data: Motorwise Workshop. Bulletin 2.
Unable to lift engine from engine bay
Cause
Engine bay too narrow for engine to be lifted out.
Repair
- Remove engine and transmission from underneath the vehicle.
Data: Motorwise Workshop. Bulletin 3.
Engine oil leak
Overview
- Affects
- All models with MZR-CD (RF-Turbo) engine code.
- Remedy
- Fit modified part
Symptoms
Excessive oil consumption.
Cause
Oil seal between fuel injector and cylinder head cover detached.
Repair
- Fit modified cylinder head cover.
- Top up engine oil to correct level.
Data: Motorwise Workshop. Bulletin 4.
Excessive oil consumption
Poor sealing of fuel injectors allowing blow-by gas ingress into engine oil. Fix: fit a new part.
Overview
- Affects
- All models with MZR-CD (RF-Turbo) engine code.
- Remedy
- Fit new part
Symptoms
Carbon deposit build up in engine.
Repair steps
- Remove fuel injectors. Thoroughly clean all mating surfaces.
- Fit new copper washer to fuel injector.
- Install fuel injectors. Ensure fuel injector retaining bolt tightened to correct torque setting.
- Flush engine oil system with a suitable flushing oil.
- Change engine oil and filter.
Data: Motorwise Workshop. Bulletin 5.
Electrical & ignition
2 documented faults — symptoms, causes and workshop fixes.
Intermittent failure of indicators/hazard warning lamps. Blown fuse
Overview
- Affects
- All models.
Cause
Exterior lighting wiring harness chafes against AC high-pressure pipe, located under LH headlamp, causing short circuit.
Repair
- Repair wiring harness as necessary.
- Replace fuse.
Data: Motorwise Workshop. Bulletin 6.
Indicators flash erratically
Overview
- Affects
- All models.
- Remedy
- Fit new part
Symptoms
Intermittent failure of indicators/hazard warning lamps.
Cause
Multifunction control module faulty.
Repair
- Carry out electrical, mechanical and component tests (as applicable) to eliminate any other possible cause(s).
- If no fault(s) found: Fit new multifunction control module.
Data: Motorwise Workshop. Bulletin 7.
Clutch & gearbox
1 documented fault — symptoms, causes and workshop fixes.
Whining/grinding noise from front of engine
Symptoms
Excessive noise from auxiliary drive belt.
Cause
Failure of alternator pulley clutch.
Repair
- Replace alternator.
Data: Motorwise Workshop. Bulletin 8.
Glossary
Technical terms used in this guide.
- DPF
- Diesel particulate filter — traps soot in the exhaust and burns it off periodically
- AC
- Air conditioning — the system that cools the cabin
- LH
- Left-hand — the left side of the vehicle as you sit in it
- DPF Regeneration
- The process that burns soot out of the diesel particulate filter, usually on a longer run
- Multifunction Control Module
- The control module that runs shared electrical functions (lights, wipers, locking, and so on)
- Solenoid
- An electrically operated valve or actuator
- Wiring Harness
- The bundled cables that carry power and signals around the vehicle
- Alternator
- The unit that charges the battery while the engine is running
- Auxiliary Drive Belt
- The belt that drives the alternator, water pump, steering pump or air-conditioning compressor
- Oil Seal
- A rubber seal that keeps oil in and dirt out, typically around a rotating shaft
Frequently asked questions
What are the common faults with the Mazda 6 2.0 Turbo?
This guide contains eight workshop bulletins for the Mazda 6 2.0 Turbo. Of these, five concern the engine and fuel system and two the electrical and ignition. Symptoms, causes, repair steps and part numbers are shown where supplied.
Does every Mazda 6 2.0 Turbo have these faults?
No. These are patterns documented across the model by workshops, not predictions for an individual vehicle. Where a fault applies only to certain vehicles or VIN ranges, that is listed with the fault.
Can I check for Mazda 6 2.0 Turbo faults myself?
Many of them. The documented symptoms can be seen, heard or felt during a test drive.