4.0L SOHC Timing Chain & Tensioner Wear
high- Typically appears
- 80–150k mi
- Estimated repair
- $900 – $2,200
2007 Ford
ExplorerSUV
SUV
The 2007 Ford Explorer is a fifth-generation body-on-frame mid-size SUV that had been a sales staple for Ford since the early 1990s. By 2007 it carried a more refined interior and a choice of V6 or V8 engines, though this particular example is equipped with the carryover 4.0L SOHC V6 — a proven but aging design with some well-documented weak spots. It seats up to seven, tows adequately, and offers a traditional truck-based ride quality that many buyers in snowy climates appreciate. The 2007 model year sits in the final stretch of the fourth-generation platform (2006–2010), not the fifth — the platform that received significant upgrades over the notorious 2002–2005 rollover-era Explorers. Reliability improved noticeably with this refresh, though it's still not without its quirks, particularly around the 4.0L's timing chain system and cooling components. For buyers in the Lake Geneva area, the Explorer's available 4WD (note: the data flags this unit as RWD — confirm before purchase if winter traction is a priority) and relatively high ground clearance are positives. The big negatives are fuel economy and the 4.0L's expensive timing chain service if deferred too long.
Reliability
3/5
Verified data
Specs shown for Explorer Sport Trac 2WD — the most common configuration.
Other trims may vary in engine, drivetrain, or fuel economy. Sign in to see your vehicle's exact specs.
Engine
[object Object]
Drivetrain
RWD
Fuel
Gasoline
MPG
13 city / 19 hwy / 15 combined
Seats
—
Doors
—
Body
Standard Pickup Trucks 2WD
Overview
AI-curatedThe 2007 Ford Explorer is a fifth-generation body-on-frame mid-size SUV that had been a sales staple for Ford since the early 1990s. By 2007 it carried a more refined interior and a choice of V6 or V8 engines, though this particular example is equipped with the carryover 4.0L SOHC V6 — a proven but aging design with some well-documented weak spots. It seats up to seven, tows adequately, and offers a traditional truck-based ride quality that many buyers in snowy climates appreciate. The 2007 model year sits in the final stretch of the fourth-generation platform (2006–2010), not the fifth — the platform that received significant upgrades over the notorious 2002–2005 rollover-era Explorers. Reliability improved noticeably with this refresh, though it's still not without its quirks, particularly around the 4.0L's timing chain system and cooling components. For buyers in the Lake Geneva area, the Explorer's available 4WD (note: the data flags this unit as RWD — confirm before purchase if winter traction is a priority) and relatively high ground clearance are positives. The big negatives are fuel economy and the 4.0L's expensive timing chain service if deferred too long.
Known for
- Spacious three-row cabin with reasonable cargo flexibility
- Capable tow rating (up to 3,500–5,295 lbs depending on engine/hitch package)
- Aging 4.0L SOHC V6 with a known timing chain design that requires timely oil changes
- Comfortable highway ride for a body-on-frame SUV
- Strong parts availability and widespread independent-shop familiarity
Best for
- Families needing a third row without minivan stigma
- Light-duty towing and hauling
- Buyers who want a known quantity with cheap parts
- Around-town and highway commuters who can live with the fuel economy
Watch for
- 4.0L SOHC timing chain and tensioner wear — can be catastrophic if neglected
- Coolant leaks from the intake manifold and thermostat housing
- Rear ABS/wheel speed sensor corrosion (critical in salt-belt states like Wisconsin)
- Rust on frame, rocker panels, and brake lines on high-mileage Midwest examples
- RWD-only models are at a serious disadvantage in Wisconsin winters — verify drivetrain
Common issues by mileage
6 knownVCT/VVT Solenoid Failure
medium- Typically appears
- 70–130k mi
- Estimated repair
- $150 – $450
Oxygen Sensor & Heater Circuit Failure
medium- Typically appears
- 80–120k mi
- Estimated repair
- $120 – $320
Rear ABS / Wheel Speed Sensor Corrosion
high- Typically appears
- 60–120k mi
- Estimated repair
- $150 – $400
Cooling System Leaks (Intake & Thermostat Housing)
high- Typically appears
- 75–130k mi
- Estimated repair
- $200 – $600
CAN Bus / Module Communication Faults
medium- Typically appears
- 100k+ mi
- Estimated repair
- $100 – $800
Maintenance schedule
- 1 Every 5,000 mi or 6 months — do not stretch Engine oil & filter change (use 5W-20 full synthetic)
The 4.0L timing chain system is entirely oil-pressure fed. Dirty or low oil is the #1 cause of premature chain and tensioner failure. In cold Wisconsin winters, a full synthetic flows faster on cold starts, reducing wear during warm-up.
- 2 Every 30,000 mi or at first sign of discoloration Coolant flush and pressure test
Degraded coolant accelerates corrosion in the plastic intake crossover and thermostat housing — the two most common leak points on this engine.
- 3 Every 30,000 mi Transmission fluid change (5R55S automatic)
Ford's service interval is long, but independent shops in the Midwest see early transmission wear on high-mileage Explorers that never had fluid changed. Use Mercon V fluid only.
- 4 Every 2 years or as needed Inspect and grease front driveshaft U-joints and slip yoke (if equipped with 4WD/AWD)
Road salt dries out U-joint grease and causes vibration and premature failure. RWD models still have a rear driveshaft to inspect.
- 5 Every fall (before first freeze) Load-test battery and inspect terminals
Cold Wisconsin winters tax batteries heavily. Most factory batteries are spent by year 4–5. A weak battery also triggers U-series CAN communication faults.
- 6 Every brake inspection (annually minimum) Inspect brake lines, ABS sensor wiring, and caliper slide pins for corrosion
Salt-belt Explorers commonly develop rust-compromised brake lines and seized caliper slides by 80–100k miles. Catch these before they become safety failures.
- 7 Every 60,000 mi Spark plug replacement (Motorcraft Platinum recommended)
Plugs left past 75k on the 4.0L can seize in the aluminum head, making removal very difficult and expensive. Pull them on schedule.
- 8 Every fall Top off washer fluid with -20°F rated solution and replace wiper blades with winter blades
Standard washer fluid freezes in Lake Geneva winters and can crack the reservoir or pump. Summer blades ice up and skip on a frosty windshield.
Always defer to the manufacturer's service manual for warranty-mandated intervals.
Cost of ownership
Annual maintenance
$700 – $1,600
Fuel
At 15 mpg combined and roughly 12,000 miles/year, expect around $2,200–$2,600/year at current Midwest gas prices. This is one of the higher fuel costs in the mid-size SUV segment.
Insurance
Typically moderate — mid-size SUV rates, no significant surcharges. Expect $900–$1,400/year for a standard Wisconsin policy depending on driver profile.
The 2007 Explorer is inexpensive to buy used but carries above-average fuel costs and meaningful maintenance exposure, especially around the 4.0L timing system. Budget $700–$1,600/year for routine maintenance in normal years, and keep a $1,500–$2,500 reserve for timing chain or transmission work on high-mileage examples. Parts are widely available and inexpensive — labor is the cost driver on big jobs.
Seasonal care
Lake Geneva, WI Winter
- Verify antifreeze protection to at least -34°F before freeze season — the 4.0L's plastic cooling components are unforgiving of a freeze event.
- Load-test the battery every fall. Cold starts on a tired battery stress the alternator and can trigger CAN bus faults (U0100–U0104).
- Switch to a full synthetic 5W-20 if not already running one — critical for fast oil flow to the timing chain tensioners on sub-zero cold starts.
- Flush washer fluid reservoir and refill with -20°F rated fluid; install winter wiper blades.
- Inspect and treat brake lines and frame for rust — Lake Geneva road salt is aggressive and brake line failure is a real risk on older body-on-frame trucks.
- If this is a 4WD-equipped unit, test the transfer case engagement in a safe area before winter hits. If it's RWD-only, seriously consider all-season or dedicated winter tires for local road conditions.
Summer
- Check tire pressure monthly — the 4,450-lb curb weight means underinflation causes heat buildup and accelerates wear; pressure drops ~1 PSI for every 10°F temperature swing.
- Inspect the A/C system — the condenser sits low and is vulnerable to road debris; check for leaks and verify the cabin filter is clean for maximum airflow.
- Check coolant level cold before long trips — hot-weather heat soak amplifies any small leak from the intake crossover or thermostat housing into a bigger problem fast.
- Inspect serpentine belt and tensioner — heat accelerates belt degradation on high-mileage engines.
Comparable vehicles
2007 Chevrolet
TrailBlazer
Same era body-on-frame mid-size SUV, inline-6 or V8, similar tow capacity and seating. Generally comparable reliability with its own set of known issues (water pump, cooling). Widely available in the Midwest.
2007 Jeep
Grand Cherokee
Competes directly in price and mission. Better on-road manners and stronger 4WD system, but the 3.7L V6 is weaker and the 4.7L V8 drinks more fuel. Higher repair costs if the Hemi or electronics act up.
2007 Toyota
4Runner
Same body-on-frame mid-size SUV mission. The 4.0L V6 4Runner is significantly more reliable long-term and holds value better, but commands a higher used price for that reason. Worth the premium for buyers planning 150k+ miles.
2007 Nissan
Pathfinder
Similar footprint and three-row capacity. The 4.0L V6 Pathfinder is more fuel-efficient but the third row is tighter. Watch for CVT issues on higher-mileage examples — otherwise a solid alternative.