Thinking about buying a used Mazda Mazda6 (2002–2021) in New Zealand? We've documented 39 known faults for this model spanning engine, body & rust, transmission, and suspension. Each researched and verified before it's published. The most serious issues here are rated critical. Two are set out in full below — the rest, with the symptoms, repair costs and checks for each, are free with an account.
39
Documented faults
Critical
Most serious
$500–$2,800
Typical repair
7
Systems covered
Known Mazda Mazda6 faults
Every fault below is documented specifically for this model — researched and verified before it’s published.
01SkyActiv-D High-Pressure Fuel Pump Wear and Failure
CriticalOccasionalEngine $1,800–$9,500 to fix
The 2.2L SkyActiv-D common-rail diesel relies on a cam-driven high-pressure fuel pump to generate the 180 MPa injection pressures required by the piezoelectric injectors. The pump internals are susceptible to wear from low-lubricity fuel and metal contamination, particularly on examples with irregular fuel filter servicing, and can produce metallic debris that circulates through the fuel rail and causes injector damage. Failure typically manifests as hard starting, injector rattling, and fault codes for low rail pressure, potentially requiring replacement of both the pump and all four injectors in a worst-case scenario.
Symptoms to notice
Hard starting, especially when cold or after the car has sat overnight
Rough or uneven idle with a rattling noise from the injectors
P0087 (fuel system pressure low) or P0191 fault codes on OBD scan
Severe power loss or engine stall under load
Metal particles visible in drained fuel filter housing on inspection
What to check
Request full service history with fuel filter replacement intervals confirmed — the SkyActiv-D filter should be replaced every 40,000 km. On the test drive, listen at idle for injector rattle or ticking inconsistent with normal diesel clatter. Scan for P0087 (fuel rail pressure low) or P0191 fault codes. If a workshop inspection is possible: Connect a diagnostic tool and read live fuel rail pressure — it should stabilise at or above 180 bar at idle.
Where to look: High-pressure pump mounted on the engine front, fuel rail running along the top of the cylinder head
Ask the seller
“Has the fuel filter been replaced at every 40,000 km as specified, and do you have receipts?”
“Has the car ever had hard-starting issues or been diagnosed with low fuel rail pressure?”
“Have any injectors or the high-pressure fuel pump been replaced during ownership?”
02Timing chain and VVT rattle on 2.5 L5 petrol at high mileage
MinorOccasionalEngine $1,200–$2,500 to fix
The GH's 2.5 petrol is the safe pick, but high-mileage or oil-change-neglected examples develop a rattle on cold start from a worn variable valve timing actuator and stretched timing chain — the same L-series weakness Mazda saw on related 2.3/2.5 engines. It progresses slowly, but a full chain, guides and VVT actuator job is labour-intensive. Cars with documented regular oil changes rarely suffer it.
Symptoms to notice
Rattle for a few seconds on cold start
Persistent light rattle at idle when worn further
Check-engine light with cam/crank correlation codes
What to check
Cold-start the car yourself and listen at the front of the engine for a rattle in the first few seconds. Review the service history for oil-change intervals — anything beyond 10,000 km intervals raises the risk. A quick OBD2 scan for stored P0016/P0011-type codes is worthwhile.
Where to look: Timing chain and VVT actuator at the front of the engine, behind the timing cover
Ask the seller
“Does it rattle on cold start?”
“Can you show the oil change history?”
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37 more documented faults on the Mazda Mazda6
Symptoms, what to check, where to look and what to ask the seller — for every fault above. Free with an account, no card needed. One account covers one vehicle, so make it the car you’re actually looking at.
This page covers the model. Enter the plate of the actual car you’re looking at and see its year, engine, safety rating and register flags — free, no account needed.
Like any used car, it depends on the specific example and its service history. Across the 39 documented faults for the Mazda Mazda6, the recurring problem areas are engine, body & rust, and transmission. A Mazda Mazda6 with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.
What are the most common problems with a used Mazda Mazda6?
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We've catalogued 39 known faults for the Mazda Mazda6, covering engine, body & rust, and transmission. Two are written out in full on this page. The rest — with the symptoms to notice, what to inspect, and typical repair costs for each — are free once you create an account.
How much do repairs cost on a Mazda Mazda6?
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Most single repairs on the Mazda Mazda6 fall between $500–$2,800 at NZ independent-workshop rates. Some of the 39 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.
Should I get a pre-purchase inspection on a Mazda Mazda6?
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Yes. A Mazda Mazda6 inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $17.90 far less than the cost of missing one of the faults on this page.