Key Takeaways at a Glance

• The 2002 Nissan Altima SL is the top-tier trim, offering leather seats, upgraded audio, and a smoother ride compared to base models.
• A common complaint across all trims is premature transmission failure, especially in the 5-speed automatic model.
• Engine oil consumption and faulty front strut bearings are two of the most frequent mechanical issues owners report.
• Reliability scores average around 3.5 out of 5 — decent for its class but below rivals like the Honda Accord and Toyota Camry.
• Annual maintenance costs hover around $500–$650, which is competitive within the midsize sedan segment.
• When shopping one, prioritize vehicles with documented service records and always inspect the transmission before purchasing.

What Is the 2002 Nissan Altima SL?

The 2002 Nissan Altima entered its second generation (the L31 platform), and it quickly established itself as a credible competitor to the Honda Accord and Toyota Camry. The SL trim sat at the top of the Altima lineup for 2002, adding premium features that justified its higher price tag.

Under the hood, every 2002 Altima — including the SL — uses a 2.5-liter inline-four engine (QR25DE) producing 170 horsepower and 168 lb-ft of torque. The SL trim was exclusively available with the optional 3.5-liter V6 (VQ35DE) in some configurations, delivering 240 horsepower and a more refined driving experience.

What Makes the SL Trim Different?

• Leather-trimmed seating surfaces with heated front seats
• Upgraded Bose or Sony audio system (depending on options package)
• Unique 16-inch alloy wheels
• SofTex or leather seat materials with enhanced cushioning
• Chromed interior accents and premium door trim
• Available sunroof and reverse-sensing technology

2002 Nissan Altima SL Common Problems — And How to Fix Them

Problem 1: Transmission Failure (Most Critical Issue)

What happens: The 5-speed automatic transmission in early-generation Altimas developed a reputation for premature wear. Symptoms include harsh shifting, slipping between gears, delayed engagement, and eventual total failure. The issue is often traced to deteriorating valve body seals and worn clutch packs.

How much to fix: A rebuilt transmission runs $2,500–$3,500. Some owners opt for a unit swap from a salvage yard ($800–$1,500 parts only).

Prevention tip: Change transmission fluid every 30,000 miles using Nissan Genuine MTF API GL-4 fluid. Avoid towing or hard acceleration if the fluid hasn't been serviced regularly.

Problem 2: Excessive Oil Consumption

What happens: The QR25DE engine is prone to burning oil due to stiff or clogged piston rings. Owners commonly report needing a quart of oil every 1,000–1,500 miles.

How much to fix: Using higher-viscosity synthetic blends (10W-30 instead of 5W-30) can reduce consumption. Ring replacement requires significant labor ($1,200–$2,000 at a shop).

Prevention tip: Monitor your dipstick weekly. Switch to a full synthetic 10W-30 immediately if you notice the level dropping faster than normal.

Problem 3: Front Strut Bearing Noise

What happens: A rattling or grinding noise from the front suspension, especially when turning at low speeds, typically indicates worn front strut tower bearings. This is one of the most frequently reported NVH (noise, vibration, harshness) complaints among 2002 Altima owners.

How much to fix: Replacing the front strut bearing assemblies costs approximately $150–$300 per side for parts alone. Labor adds another $200–$400 depending on the shop.

Prevention tip: Listen for any clunking over bumps or during parking-lot turns. Early detection prevents secondary damage to the strut assembly and steering components.

Problem 4: Radiator Corrosion and Coolant Leaks

What happens: Internal corrosion of the aluminum radiator can lead to slow coolant loss and eventual overheating. This is more common in vehicles that never had the coolant flushed on schedule.

How much to fix: Replacement radiator costs $250–$450 parts. Labor is relatively straightforward at 2–3 hours ($200–$400 depending on regional rates).

Prevention tip: Flush the cooling system every 40,000–50,000 miles with a proper radiator flush solution. Never mix coolant types without a complete system flush.

Problem 5: Power Steering Rack Leak

What happens: The power steering rack seal on the 2002 Altima tends to leak over time, resulting in low fluid levels and a whining noise when turning the wheel.

How much to fix: Rack rebuild kits are available for $80–$150, but many mechanics recommend a remanufactured rack assembly ($400–$700 installed).

Prevention tip: Check under the vehicle for reddish-brown fluid pooling near the front wheels. Top off steering fluid between services rather than waiting for a visible leak.

Is the 2002 Nissan Altima SL Reliable?

Yes — with caveats. On aggregate reliability ratings, the 2002 Altima earns a 3.5 out of 5 from major automotive review sources. It's reliable enough for daily commuting, but prospective buyers should budget for the known issues above and ideally avoid high-mileage examples without proof of regular maintenance.

Compared to its main rivals: