Oil consumption — QR25DE engine burning oil between changes
high- Typically appears
- 80–150k mi
- Estimated repair
- $50 – $300
2002 Nissan
AltimaSedan
Sedan
The 2002 Nissan Altima marked a major generational leap — this was the first year of the fourth-generation (L31) platform, and it arrived with a completely new body, a larger cabin, and Nissan's then-new QR25DE 2.5L four-cylinder as the standard engine. It moved upmarket in size and feel, competing squarely with the Camry and Accord while undercutting them on price. Buyers got a genuinely roomy mid-size sedan for what the previous Altima charged as a compact. Being a first model year of a new generation, the 2002 Altima came with some growing pains — most notably early CVT (if equipped with the 3.5L V6/automatic combo) and some oil consumption quirks in the QR25DE. That said, the platform itself proved durable, and well-maintained examples with the 2.5L engine have accumulated well over 200,000 miles in everyday use. For a budget-conscious buyer in 2025, a clean 2002 Altima 2.5 with documented maintenance is a functional, parts-friendly daily driver. Just go in with eyes open about rust — Wisconsin winters are brutal on these unibodies, and the 2002 model is now over 20 years old.
Reliability
3/5
Verified data
Specs shown for Altima — the most common configuration.
Other trims may vary in engine, drivetrain, or fuel economy. Sign in to see your vehicle's exact specs.
Engine
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Drivetrain
FWD
Fuel
Gasoline
MPG
20 city / 27 hwy / 23 combined
Seats
—
Doors
—
Body
Midsize Cars
Overview
AI-curatedThe 2002 Nissan Altima marked a major generational leap — this was the first year of the fourth-generation (L31) platform, and it arrived with a completely new body, a larger cabin, and Nissan's then-new QR25DE 2.5L four-cylinder as the standard engine. It moved upmarket in size and feel, competing squarely with the Camry and Accord while undercutting them on price. Buyers got a genuinely roomy mid-size sedan for what the previous Altima charged as a compact. Being a first model year of a new generation, the 2002 Altima came with some growing pains — most notably early CVT (if equipped with the 3.5L V6/automatic combo) and some oil consumption quirks in the QR25DE. That said, the platform itself proved durable, and well-maintained examples with the 2.5L engine have accumulated well over 200,000 miles in everyday use. For a budget-conscious buyer in 2025, a clean 2002 Altima 2.5 with documented maintenance is a functional, parts-friendly daily driver. Just go in with eyes open about rust — Wisconsin winters are brutal on these unibodies, and the 2002 model is now over 20 years old.
Known for
- Spacious interior for its class — a big jump from the previous-gen Altima
- Strong, rev-happy QR25DE 2.5L four-cylinder engine
- First-year model of a new generation — some early production quirks
- Affordable purchase price and widely available parts
- Competitive fuel economy for a mid-size sedan of its era
Best for
- Budget-minded commuters needing a reliable daily driver
- Buyers who want a parts-abundant, independent-shop-friendly vehicle
- Someone comfortable wrenching or paying for occasional older-car upkeep
- Urban and suburban driving with occasional highway use
Watch for
- Rust — frame rails, subframe, and rocker panels corrode aggressively in Wisconsin salt
- Oil consumption from the QR25DE engine, especially past 100k miles
- Automatic transmission reliability on early examples — fluid maintenance history matters
- Exhaust and suspension components that rust solid and become expensive to remove
- First-year model quirks: check for any outstanding or previously addressed recalls
Common issues by mileage
6 knownCatalytic converter / oxygen sensor failure
high- Typically appears
- 100–180k mi
- Estimated repair
- $300 – $900
Automatic transmission slipping or harsh shifts (fluid neglect)
medium- Typically appears
- 90–160k mi
- Estimated repair
- $600 – $2,800
Underbody / subframe rust (rocker panels, control arm mounts, exhaust)
high- Typically appears
- Any — age-related in Wisconsin
- Estimated repair
- $200 – $2,500
Struts and front suspension wear (ball joints, tie rods)
medium- Typically appears
- 80–140k mi
- Estimated repair
- $350 – $900
Camshaft position sensor / timing chain stretch (VTC noise on cold start)
medium- Typically appears
- 100–160k mi
- Estimated repair
- $400 – $1,200
Maintenance schedule
- 1 Every 5,000 miles or 6 months — sooner if oil consumption is noted Engine oil and filter change
The QR25DE is oil-change sensitive. Neglected oil is the primary cause of premature engine wear and timing chain issues on this motor. Check the dipstick monthly on high-mileage examples.
- 2 Every 30,000 miles if history is unknown; every 45,000 miles if documented Automatic transmission fluid change
Nissan's early 4-speed automatic in the 2002 Altima does not tolerate degraded fluid. Many failures trace directly to extended drain intervals.
- 3 Every 50,000 miles or 5 years Coolant flush
Old coolant loses its corrosion inhibitors, attacking the aluminum heads and radiator — especially relevant in a car this age.
- 4 Every 30,000 miles (conventional plugs on this engine) Spark plug replacement
Worn plugs worsen fuel economy and can cause misfires. The QR25DE responds well to fresh plugs for smooth idle.
- 5 Every 2–3 years Brake fluid flush
Brake fluid absorbs moisture over time. Wisconsin's temperature swings accelerate this — wet fluid lowers boiling point and promotes caliper and ABS unit corrosion.
- 6 Every fall before salt season Undercarriage rust inspection and treatment
At 20+ years old, the subframe mounting points and control arm brackets are prime rust targets. Catching and treating surface rust before it becomes structural is far cheaper than replacing corroded components.
- 7 At 100,000 miles and every 40,000 miles thereafter Timing chain and VTC actuator inspection
The QR25DE uses a timing chain, not a belt, but chain stretch and VTC actuator wear are documented — especially on engines that ran low on oil. A rattling cold start is the warning sign.
- 8 Every 15,000–20,000 miles Cabin and engine air filter replacement
Wisconsin road grit and fall leaf debris clog filters faster than in drier climates. A clogged engine air filter hurts fuel economy noticeably on this motor.
Always defer to the manufacturer's service manual for warranty-mandated intervals.
Cost of ownership
Annual maintenance
$600 – $1,400
Fuel
At 23 MPG combined and ~12,000 miles/year, expect roughly $1,400–$1,700/year at $2.70–$3.25/gallon (regular unleaded).
Insurance
Typically low — older, low-value sedan. Expect $600–$1,100/year for full coverage depending on driver profile; liability-only can be under $500.
The 2002 Altima is genuinely cheap to own if the car is rust-free and well-maintained. Parts are inexpensive and widely available. The risk comes from deferred maintenance catching up — a neglected transmission or an engine that's consumed oil unchecked can generate a single repair bill that dwarfs several years of normal upkeep. Budget a bit extra for age-related rubber and suspension items.
Seasonal care
Lake Geneva, WI Winter
- Rinse the undercarriage at a touchless car wash every 2 weeks during salt season — subframe and control arm mounts rust through on these cars.
- Test the battery before November. Cold cranking amps drop sharply below 20°F, and a marginal battery will fail in a Lake Geneva winter.
- Switch to a full-synthetic 5W-30 if still running conventional oil — it flows faster on sub-zero cold starts and reduces timing chain wear during warm-up.
- Use winter-rated washer fluid rated to at least -20°F. The stock reservoir and lines are plastic and can crack if fluid freezes.
- Inspect wiper blades and consider winter-style blades to prevent ice buildup on the blade frame.
- Check tire pressure weekly — pressure drops roughly 1 PSI for every 10°F temperature decrease, and underinflated tires worsen handling on snow and ice.
Summer
- Check coolant level and condition before summer heat — a 20-year-old cooling system with neglected coolant is a breakdown waiting to happen.
- Inspect the A/C system for refrigerant leaks and verify the condenser fins aren't clogged with debris. The QR25DE runs warm under A/C load.
- Re-check tire pressure as temperatures climb — pressure increases roughly 1 PSI per 10°F, and overinflated tires reduce contact patch on hot pavement.
- Inspect the serpentine belt for cracking — heat accelerates rubber degradation on a belt this age.
- Park in shade when possible. The 2002 Altima's interior plastics and dashboard are now 20+ years old and prone to cracking under UV exposure.
Comparable vehicles
2002 Toyota
Camry
Same mid-size FWD sedan segment, similar pricing used, arguably stronger long-term reliability reputation — but also more expensive to buy clean.
2002 Honda
Accord
Direct competitor in price, size, and mission. The Accord's F-series engine has a slightly stronger reliability track record at high mileage; rust susceptibility is similar in the Midwest.
2002 Mazda
626
Similar front-drive mid-size sedan at the same price point. Less common, so parts can be harder to find, but a good alternative if a clean example appears.
2002 Hyundai
Sonata
Competes on price and size; typically cheaper to buy used. Build quality of this era lags behind the Altima, but it's a viable budget alternative.
If you're shopping for one
Red flags
- Any rust perforation on the subframe or unibody — walk away, as structural rust repair often exceeds the car's value.
- Blue or white exhaust smoke indicating oil burning or coolant loss.
- Automatic transmission that hesitates, slips, or clunks shifting through gears.
- Cold-start timing chain rattle that persists more than a few seconds.
- Mismatched or poorly blended paint panels suggesting prior accident repair without proper disclosure.
- No maintenance records on a high-mileage example — the QR25DE's oil change history matters enormously.
What to inspect
- Crawl under the car and inspect the subframe, control arm mounting points, and rocker panels for rust perforation — this is the make-or-break check on any 20-year-old Wisconsin car.
- Check the exhaust system from the manifold back; rusted-solid flanges and rotted mid-pipes are common and add to repair costs.
- Pull the oil dipstick and check level and color — low oil or milky oil is a red flag for consumption or head gasket issues.
- Ask for transmission fluid history. Dark, burnt-smelling fluid on the automatic means deferred maintenance.
- Start the engine cold and listen for a timing chain rattle in the first 5–10 seconds — a sign of VTC actuator or chain wear.
- Test all four windows, the A/C compressor engagement, and the heat output — electrical gremlins and HVAC wear are common on cars this age.
- Look at the spare tire well for rust or water intrusion, which often indicates trunk seal failure.