Interior component of engine failed, causing the engine to throw a rod at 66,000 miles. Not normal wear and tear, dealer & corporation are refusing to cover cost of repairs, nor are they willing to investigate an apparent manufacture error, or accept full responsibility. *tr
2007 Mazda Mazda6 engine problems
moderate 13 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
13
Recalls
0
Avg fix
$3,100
When does it fail?
Of the 13 engine complaints filed for the 2007 Mazda Mazda6, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Among the 9 model years of Mazda Mazda6 in our records for engine problems, this one ranks #3 by owner-complaint volume.
No new NHTSA engine complaint has been filed on this vehicle in over 16 years — the issue may be aging out of the active population.
The failure pattern owners describe
Buyer takeaway: The 2007 Mazda6 has multiple serious engine issues reported: early catalytic converter/exhaust problems on new units, rear main seal leaks at low mileage, timing chain failures requiring kit replacement, and catastrophic internal failures like thrown rods. Warranty denials and dealer resistance to investigating manufacturing defects are common, making repair costs a risk even on used examples.
The 2007 Mazda6 engine failures span a troubling range. On brand-new units, owners heard rattling and squealing from the catalytic converter and exhaust—sometimes within days of delivery—which persisted after dealer repairs. Oil leaks at the rear main seal appeared at mileage as low as 2,800 miles and continued to turn up at higher mileage, with Mazda refusing warranty claims over missing oil-change records or expired coverage.
Drivability issues included sudden power loss (possibly EGR related), shimmy and hesitation during acceleration with illuminated warning lights, and complete engine stalling under load at low mileage. More severe failures—bent connecting rods, thrown rods, and timing chain/tensioner failures requiring full kit replacement—occurred at various mileages and prompted dealers to deny coverage by blaming owner maintenance or aftermarket parts.
Early failures in ticking noise, VVT actuator noise, and a faulty cooling fan relay that runs 5–10 minutes after shutdown also surface. Throughout these reports, owners cite warranty denials, dealer resistance to investigation, and unsympathetic responses to manufacturing defects. The timing chain issue in particular is noted as widespread with no recall.
Same Mazda Mazda6 engine reports on nearby years: 2005 · 2006
Failure modes owners describe
Catalytic converter rattle and squealing
Rattling from catalytic converter area and high-pitched squealing from engine, especially in reverse/drive when hot. Dealer replaced springs and exhaust seal without full resolution.
When: 150 miles (brand new)
Symptoms owners cite: rattle from converter area; high-pitched squealing when stopped in reverse/drive; worse after initial repair; vehicle feels sluggish
Repairs/costs cited: Springs and doughnut seal in exhaust pipe to manifold replaced; later diagnosed as catalytic converter issue
Engine ticking noise and warranty denial
Ticking noise reported within warranty period. Dealer took top of motor apart claiming good maintenance, but then denied warranty claim citing insufficient oil-change records, allegedly to avoid repair cost.
When: Early in vehicle life
Symptoms owners cite: ticking noise from engine
Repairs/costs cited: Dealer planned to remove top of motor; warranty ultimately denied
Recalls/TSBs owners mention: Warranty denied due to missing oil-change records
Rear main seal oil leak
Oil leak at engine rear main seal at relatively low mileage (2,800 and 84,808 miles reported). Owner performed regular oil changes with compatible filters; Mazda refused warranty coverage citing non-dealership service and expired warranty.
When: 2,800 miles and 84,808 miles
Symptoms owners cite: oil leak at rear main seal; oil coagulating on under-engine shield
Repairs/costs cited: Requires replacement of rear main seal; one owner awaiting engine replacement they cannot afford
Recalls/TSBs owners mention: Warranty refused due to expired coverage and non-dealership oil-change service; warranty language ambiguous on oil-filter brand requirement
Bent connecting rod
Clutch pedal vibration diagnosed as bent connecting rod in engine. Dealer claimed aftermarket cold-air intake drew water during puddle crossing, denying warranty. Other mechanics questioned whether intake could have drawn sufficient water.
When: <UNKNOWN>
Symptoms owners cite: clutch pedal vibration
Repairs/costs cited: Clutch and flywheel replaced first; bent connecting rod ultimately found
Recalls/TSBs owners mention: Warranty denied; dealer blamed aftermarket intake and water ingestion
Engine shimmy, hesitation, and intermittent warning light
Vehicle shimmies and hesitates during acceleration; engine warning light illuminated. Technician cleared code by disconnecting battery. Failure then occurred intermittently and could not be reproduced for diagnosis.
When: 5,000 miles
Symptoms owners cite: shimmy and hesitation during acceleration; engine warning light
Codes mentioned: engine warning light (code cleared without resolution)
Repairs/costs cited: Battery disconnected to clear code; no root cause identified
VVT actuator failure
Loud abnormal noise from front of engine on startup without warning. Diagnosed as faulty VVT (variable valve timing) actuator and replaced under warranty.
When: 119,869 miles
Symptoms owners cite: loud abnormal noise from front of engine on startup
Repairs/costs cited: VVT actuator replaced
Recalls/TSBs owners mention: Manufacturer notified; repair completed under warranty
Engine stall under load
Engine stalled while driving in gear under load at approximately 3,500 RPM about one minute after startup. Vehicle had low mileage, good fuel level, and normal weather conditions.
When: 1,900 miles
Symptoms owners cite: engine stall while driving in gear under load
Timing chain and tensioner failure
Engine made horrific noise, especially during acceleration. Required replacement of entire timing chain kit and tensioner assemblies. Owner notes this appears to be a widespread issue among Mazda vehicles without recall.
When: <UNKNOWN>
Symptoms owners cite: horrific noise especially during acceleration
Repairs/costs cited: Timing chain kit and tensioner assemblies replaced
EGR valve failure causing power loss
Sudden, unpredictable loss of engine power with no warning, potentially due to faulty EGR valve. Vehicle will not accelerate when failure occurs, creating hazardous situations on roads and highways during overtaking.
When: March (timing unclear)
Symptoms owners cite: sudden loss of engine power; vehicle will not accelerate
Cooling fan relay failure
Cooling fan module continues running 5–10 minutes after engine is shut off, suggesting faulty relay or control module. Owner notes widespread reports of this issue without recall.
When: <UNKNOWN>
Symptoms owners cite: cooling fan continues running after engine off for 5-10 minutes
Repairs/costs cited: Dealer diagnostic fee $90; no repair cost provided
Connecting rod failure (internal engine damage)
Engine threw a rod at 66,000 miles, causing catastrophic internal engine failure. Dealer and manufacturer refused to investigate or cover repair costs, citing normal wear and tear despite premature failure.
When: 66,000 miles
Symptoms owners cite: engine threw a rod
Repairs/costs cited: Engine replacement needed; cost refused by dealer/manufacturer
Recalls/TSBs owners mention: Denied coverage; refused investigation of potential manufacturing defect
Oil filter housing O-ring seal failure
O-ring used to seal oil filter housing cannot maintain seal to vehicle body without extraordinary caution during installation, risking oil loss and engine destruction if improperly installed.
When: <UNKNOWN>
Symptoms owners cite: potential oil loss if O-ring seal not properly applied
Repairs/costs cited: Proper installation technique required to prevent failure
Synthesized from 13 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
Tl* the contact owns a 2007 Mazda speed 6. While driving at various speeds the vehicle shimmies and hesitates before vehicle acceleration. Also the engine warning light was illuminated on the instrument control panel. A technician from the dealer advised him to disconnect the battery over night to delete the error code. Since the battery was disconnected the failure occurred intermittently.…
Had engine trouble with your 2007 Mazda Mazda6?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2007 Mazda Mazda6?
It's a documented issue but not catastrophic. 13 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 12 complaints that reported odometer mileage, most engine failures cluster between 41,000 and 119,869 miles, with the median around 62,800. A quarter of owners report trouble before 41,000; a quarter make it past 119,869. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2007/Mazda/Mazda6.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.