Engine & fuel system
3 documented faults — symptoms, causes and workshop fixes.
Engine malfunction indicator lamp (MIL) illuminated
Symptoms
Engine runs in limp home mode. Trouble code stored: P0440.
Cause
Evaporative emission (EVAP) canister purge valve faulty.
Repair
- Fit new evaporative emission (EVAP) canister purge valve.
Parts7 parts
| Part | Part number | Qty |
|---|---|---|
| EVAP valve | LF66-20-360K | 3 (→2005) |
| EVAP valve | L32D-20-360D | 3 (2006→) |
| EVAP valve | L391-18-740C | 6 (→2005) |
| EVAP valve | L3P9-18-740B | 6 (2006→) |
| EVAP valve | LFG1-18-741B | MX-5 |
| EVAP valve | L3P5-20-360B | 5 |
| EVAP valve | L33L-18-740B | CX-7 |
Data: Motorwise Workshop. Bulletin 1.
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 2.
Poor starting from cold
Cause
Engine coolant temperature (ECT) sensor faulty.
Repair
- Replace engine coolant temperature (ECT) sensor.
Data: Motorwise Workshop. Bulletin 3.
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 4.
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 5.
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 6.
Glossary
Technical terms used in this guide.
- AC
- Air conditioning — the system that cools the cabin
- ECT
- Engine coolant temperature — the sensor that tells the engine control module how hot the engine is
- LH
- Left-hand — the left side of the vehicle as you sit in it
- Engine Coolant Temperature
- How hot the engine is, read by a sensor the engine control module uses for fuelling and cooling fans
- Limp Home
- A protective mode that limits power so the vehicle can be driven to a workshop
- Multifunction Control Module
- The control module that runs shared electrical functions (lights, wipers, locking, and so on)
- Trouble Code
- A standardised fault code stored by a control module, read with a diagnostic tool
- 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
Frequently asked questions
What are the common faults with the Mazda 6 2.0?
This guide contains six workshop bulletins for the Mazda 6 2.0. Of these, three 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 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 faults myself?
Many of them. The documented symptoms can be seen, heard or felt during a test drive.