Rust on underbody, subframe, and brake lines
high- Typically appears
- Any mileage — age-driven
- Estimated repair
- $300 – $2,500
2001 INFINITI
GSedan
2.0L I4 (SR20DE) · Sedan
The 2001 Infiniti G20 is the second-generation (P11) G20, a compact rear-wheel-feel sedan built on Nissan's Primera platform with a transverse-mounted 2.0L four-cylinder engine. It was Infiniti's entry-level offering at the time, targeting buyers who wanted a near-luxury, sport-oriented sedan at a lower price point than the I30 or Q45. Inside, it punched above its class with leather, a sunroof, and Bose audio as common equipment. The G20 earned a reputation for being economical to run and surprisingly fun to drive, with a well-tuned suspension that rewarded spirited driving. It was never a powerhouse, but the 145-hp SR20DE engine is willing, reliable, and inexpensive to maintain. By 2001 the model had been refined through a mid-cycle update, giving it a cleaner interior and revised suspension tuning. By modern standards these cars are aging — the youngest are now well over 20 years old — so their condition varies wildly based on how they were maintained and where they lived. A well-kept G20 is still a rewarding, cheap-to-run sport sedan. A neglected one can be a money pit of deferred maintenance and rust.
Reliability
3/5
Verified data
Engine
2.0L I4 (SR20DE)
Drivetrain
FWD
Fuel
Gasoline
MPG
24 city / 31 hwy / 27 combined
Seats
5
Doors
4
Body
Sedan
MSRP
$24,400
Overview
AI-curatedThe 2001 Infiniti G20 is the second-generation (P11) G20, a compact rear-wheel-feel sedan built on Nissan's Primera platform with a transverse-mounted 2.0L four-cylinder engine. It was Infiniti's entry-level offering at the time, targeting buyers who wanted a near-luxury, sport-oriented sedan at a lower price point than the I30 or Q45. Inside, it punched above its class with leather, a sunroof, and Bose audio as common equipment. The G20 earned a reputation for being economical to run and surprisingly fun to drive, with a well-tuned suspension that rewarded spirited driving. It was never a powerhouse, but the 145-hp SR20DE engine is willing, reliable, and inexpensive to maintain. By 2001 the model had been refined through a mid-cycle update, giving it a cleaner interior and revised suspension tuning. By modern standards these cars are aging — the youngest are now well over 20 years old — so their condition varies wildly based on how they were maintained and where they lived. A well-kept G20 is still a rewarding, cheap-to-run sport sedan. A neglected one can be a money pit of deferred maintenance and rust.
Known for
- Reliable SR20DE four-cylinder engine with long service life
- Sport-tuned suspension that handles well for a front-wheel-drive sedan
- Near-luxury interior features at an entry-level price
- Economical fuel consumption for a late-1990s/early-2000s near-luxury car
Best for
- Budget-conscious buyers who want a sporty, easy-to-maintain daily driver
- Owners comfortable doing some DIY maintenance on an older vehicle
- Drivers who prioritize handling and efficiency over outright power
Watch for
- Rust on underbody, subframe, and brake lines — critical concern in Wisconsin
- High mileage examples with neglected timing chain and oil change history
- Aging rubber: coolant hoses, motor mounts, and suspension bushings all degrade with age
- Electrical gremlins from corroded connectors and aging wiring harnesses
- Parts availability shrinking as the model approaches 25 years old
Common issues by mileage
6 knownCracked or deteriorated coolant hoses and thermostat housing
high- Typically appears
- 80k–150k+ mi
- Estimated repair
- $150 – $500
Worn engine and transmission mounts causing vibration
high- Typically appears
- 80k–150k mi
- Estimated repair
- $200 – $550
Camshaft position sensor / timing chain stretch (oil change neglect)
medium- Typically appears
- 100k–180k mi
- Estimated repair
- $400 – $1,200
Oxygen sensor failure / heater circuit faults
medium- Typically appears
- 80k–150k mi
- Estimated repair
- $150 – $400
Front suspension bushing and ball joint wear
high- Typically appears
- 90k–160k mi
- Estimated repair
- $250 – $800
Maintenance schedule
- 1 Every 5,000 miles or 6 months — use full synthetic 5W-30 Engine oil and filter change
The SR20DE's timing chain longevity is directly tied to clean oil. At this age, shorter intervals are cheap insurance.
- 2 Every 30,000 miles or 2 years Coolant flush and hose inspection
20-year-old hoses and clamps are failure-prone. A cooling system failure can quickly become an overheating event and head gasket damage.
- 3 Every 2 years Brake fluid flush
Brake fluid is hygroscopic and absorbs moisture over time. On an older vehicle this accelerates internal corrosion of calipers and wheel cylinders.
- 4 At purchase, then annually Inspect and replace brake lines
Wisconsin road salt causes brake line corrosion that can lead to sudden brake failure. This is a safety-critical check on any car this age in the upper Midwest.
- 5 Every 30,000 miles Spark plug replacement
The SR20DE is not a coil-on-plug engine — worn plugs affect combustion efficiency and can foul ignition wires.
- 6 Every 30,000–45,000 miles Transmission fluid change (automatic)
Nissan's RE4F02 automatic is reliable when fluid is kept fresh. Neglected fluid causes shift quality problems and shortens transmission life.
- 7 Every 60,000 miles or at signs of cracking/glazing Serpentine belt and tensioner inspection
A belt failure strands you and can kill the engine if it interferes with the cooling fan. Age matters as much as mileage on rubber components.
- 8 Annually, preferably each spring after winter Underbody and subframe rust inspection
Wisconsin salt eats subframes and control arm mounting points. Catching it early means cleaning and coating; catching it late means expensive structural repair or a junked car.
Always defer to the manufacturer's service manual for warranty-mandated intervals.
Cost of ownership
Annual maintenance
$600 – $1,800
Fuel
At roughly 27 MPG combined and typical Wisconsin driving, expect $1,100–$1,500/year in fuel at current prices.
Insurance
Generally inexpensive to insure given age and low book value — expect $600–$1,100/year depending on coverage level and driving record.
A well-maintained G20 is one of the cheaper cars to keep running day-to-day. The SR20DE parts are affordable and the car is mechanically simple. The wildcard on a 20+ year-old vehicle is deferred maintenance catch-up: if you buy one with aging hoses, tired bushings, and a questionable brake line history, the first year of ownership can run $2,000–$4,000 in repairs before you reach steady-state. Budget for it upfront.
Seasonal care
Lake Geneva, WI Winter
- Switch to a full synthetic 5W-30 if not already used — it flows better in sub-zero Wisconsin starts and reduces wear on cold start, which is when the SR20DE's timing chain sees the most stress.
- Inspect and test the battery before November. A battery over 4 years old or below 550 CCA should be replaced — cold cranking amps drop sharply below 20°F.
- Use winter-rated washer fluid rated to at least -20°F and replace wiper blades with winter blades before the first freeze.
- Flush and inspect the cooling system — a 50/50 coolant mix protects to around -34°F; confirm your mix is correct before hard freezes arrive.
- Inspect brake lines and underbody for rust damage before winter, then again in spring. Salt accelerates existing corrosion rapidly.
- Keep the fuel tank at least half full to prevent moisture accumulation in the fuel system and add weight over the front-wheel-drive axle.
Summer
- Check tire pressure monthly — pressure drops ~1 PSI for every 10°F of temperature change, and underinflated tires run hot in summer heat.
- Inspect A/C system operation and cabin filter. The G20's A/C is old enough that the refrigerant charge and compressor seal condition should be verified each season.
- Check coolant level and watch temperature gauge closely — aging hoses and a weak thermostat show up fastest during hot weather and stop-and-go traffic.
- Inspect drive belts for cracking and glazing — heat accelerates rubber degradation on a vehicle this age.
Comparable vehicles
2001 Acura
EL
Honda Civic-based near-luxury compact sedan from the same era, similar FWD layout, similar price and mission — reliable and cheap to run.
No catalog match
2001 Lexus
ES 300
Step-up near-luxury sedan for buyers wanting more refinement; V6 power and better long-term parts availability, though significantly higher purchase price.
2001 Volkswagen
Jetta
European-flavored compact sport sedan from the same segment and price range; sporty feel but carries higher maintenance costs on aged examples.
2001 Nissan
Sentra SE-R
Uses the same SR20DE engine as the G20, similarly sporty compact, often cheaper to buy with better parts availability since it shared Nissan's mainstream parts bin.
If you're shopping for one
Red flags
- Any visible rust perforation on the floor, sills, or subframe — structural rust is a deal-breaker.
- Coolant in the oil or oil in the coolant reservoir — head gasket failure on a 20-year-old SR20DE is usually not worth repairing.
- Timing chain rattle on cold start — indicates oil neglect and a potentially expensive repair.
- Check engine light with VVT/camshaft timing codes (P0012, P0015) — points to sludge in the oil passages or a worn timing chain.
- Owner cannot provide any service records — deferred maintenance on a vehicle this age is very costly to catch up on.
- Oxygen sensor faults (P0030–P0036) combined with a rough idle may indicate deeper fuel system or wiring issues beyond simple sensor replacement.
What to inspect
- Lift the car and inspect subframe mounting points, control arm brackets, and all brake lines for rust — this is non-negotiable on a Wisconsin-market car this age.
- Check the oil filler cap and dipstick for milky sludge (head gasket/coolant intrusion) and dark, gritty oil (neglected changes).
- Warm the engine fully and listen for timing chain rattle on cold start — a rattling chain means the engine needs significant work.
- Test all four windows, the sunroof, and the HVAC blower on all speeds — electrical gremlins are common at this age.
- Drive it hard through corners and over bumps: clunks point to worn control arm bushings or ball joints, which are a safety and alignment issue.
- Check for transmission shudder or harsh shifts — a slipping or shuddering automatic on a 20-year-old car is expensive to rebuild.