2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350)

X350 / Sedan / Global (Europe, North America, Asia, Australia)

AJ-V8 4.0LAJ-V8 4.2LAJ16S 3.0L V6 (limited markets)Fiche exacte année/versionGold

Engine identity

Engine code

AJ-V8 4.0L, AJ-V8 4.2L, AJ16S 3.0L V6 (limited markets)

Engine summary

2003 XJ used Jaguar AJ-V8 engines; 4.0L and 4.2L V8 gasoline engines primarily, with a 3.0L V6 used in limited European/Asian markets.

Displacement

4.0L (3980 cc), 4.2L (4200 cc), 3.0L (2995 cc)

Power

4.0L V8: ~280 hp; 4.2L V8: ~300 hp; 3.0L V6: ~240 hp

Torque

4.0L V8: ~393 Nm; 4.2L V8: ~410 Nm; 3.0L V6: ~290 Nm

Fuel system

Multi-point fuel injection

Timing drive

Chain-driven camshafts

Port OBD

Verify by VIN and market

Oils and fluids

Type d’huile

Fully synthetic 5W-30 or 5W-40 meeting Jaguar specs

Capacité d’huile

Approx. 7.7 liters including filter (service-fill; includes filter change)

Liquide de refroidissement

Approx. 10 liters

Fluide

ZF Lifeguard 6 or equivalent automatic fluid

Differential fluid

Specified gear oil per Jaguar guidelines

Liquide de frein

DOT 4

Service and parts data

Manual transmission

Not offered (automatic only)

Automatic transmission

6-speed ZF 6HP automatic transmission

Spark plugs

Platinum-type recommended, changed every 48,000 miles / 80,000 km

Service interval

15,000 miles / 24,000 km or 1 year

Dimensions des pneus

225/55 R16, 235/50 R17, 255/40 R18

Couple de roue

Verify by VIN and market

Common and chronic problems

Air suspension compressor failure
Dashboard instrument cluster failures
Window regulator issues

First checks

Inspect air suspension functionality
Check timing chain tension and noise
Verify condition of transmission shifting

Avant de remplacer des pièces

Save fault codes and freeze-frame data before clearing anything.
Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.

Important notes

3.0L V6 primarily for European and selected Asian markets due to tax and emissions regulations.
4.2L V8 was phased in gradually and offered more widely in 2003.
Worldwide market coverage but availability of specific engines varies by region.

Codes courants

Source and verification notes

Jaguar X350 technical data sheets, 2003
Independent Jaguar XJ owner manuals and service guides, 2003

Outils compatibles

Verify by VIN and market

Questions fréquentes

What engine code does the 2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350) use? 2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350) is listed here with engine code AJ-V8 4.0L, AJ-V8 4.2L, AJ16S 3.0L V6 (limited markets); engine summary: 2003 XJ used Jaguar AJ-V8 engines; 4.0L and 4.2L V8 gasoline engines primarily, with a 3.0L V6 used in limited European/Asian markets..
What oil and capacity does the 2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350) use? 2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350) is listed with Fully synthetic 5W-30 or 5W-40 meeting Jaguar specs and oil capacity Approx. 7.7 liters including filter (service-fill; includes filter change). Confirm market and engine option before service.
What are common 2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350) problems? Highlighted checks for 2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350): Air suspension compressor failure, Dashboard instrument cluster failures, Window regulator issues.

Engine identity

Engine code

AJ-V8 4.0L, AJ-V8 4.2L, AJ16S 3.0L V6 (limited markets)

Engine summary

2003 XJ used Jaguar AJ-V8 engines; 4.0L and 4.2L V8 gasoline engines primarily, with a 3.0L V6 used in limited European/Asian markets.

Displacement

4.0L (3980 cc), 4.2L (4200 cc), 3.0L (2995 cc)

Power

4.0L V8: ~280 hp; 4.2L V8: ~300 hp; 3.0L V6: ~240 hp

Torque

4.0L V8: ~393 Nm; 4.2L V8: ~410 Nm; 3.0L V6: ~290 Nm

Fuel system

Multi-point fuel injection

Timing drive

Chain-driven camshafts

Port OBD

Verify by VIN and market

Oils and fluids

Type d’huile

Fully synthetic 5W-30 or 5W-40 meeting Jaguar specs

Capacité d’huile

Approx. 7.7 liters including filter (service-fill; includes filter change)

Liquide de refroidissement

Approx. 10 liters

Fluide

ZF Lifeguard 6 or equivalent automatic fluid

Differential fluid

Specified gear oil per Jaguar guidelines

Liquide de frein

DOT 4

Service and parts data

Manual transmission

Not offered (automatic only)

Automatic transmission

6-speed ZF 6HP automatic transmission

Spark plugs

Platinum-type recommended, changed every 48,000 miles / 80,000 km

Service interval

15,000 miles / 24,000 km or 1 year

Dimensions des pneus

225/55 R16, 235/50 R17, 255/40 R18

Couple de roue

Verify by VIN and market

Questions fréquentes

What engine code does the 2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350) use? 2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350) is listed here with engine code AJ-V8 4.0L, AJ-V8 4.2L, AJ16S 3.0L V6 (limited markets); engine summary: 2003 XJ used Jaguar AJ-V8 engines; 4.0L and 4.2L V8 gasoline engines primarily, with a 3.0L V6 used in limited European/Asian markets..

What oil and capacity does the 2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350) use? 2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350) is listed with Fully synthetic 5W-30 or 5W-40 meeting Jaguar specs and oil capacity Approx. 7.7 liters including filter (service-fill; includes filter change). Confirm market and engine option before service.

What are common 2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350) problems? Highlighted checks for 2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350): Air suspension compressor failure, Dashboard instrument cluster failures, Window regulator issues.

2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

First checks

Avant de remplacer des pièces

Important notes

Scanning Engine...

2003 JAGUAR XJ AJ-V8 4.0L/AJ-V8 4.2L (X350)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

First checks

Avant de remplacer des pièces

Important notes