| 01 |
Crankshaft / big-end bearing failure on Jaguar 3.0 TDV6, SDV6, AJD-V6 and 306DT diesel engines |
Heavy bottom-end knocking, sudden engine seizure, low oil pressure warning, metal in the oil, non-start condition or complete engine failure. |
Bearing wear, oil starvation, contaminated oil, poor lubrication history, crankshaft stress or internal wear common to the Jaguar 3.0 V6 diesel platform. |
Stop driving immediately. Inspect oil and filter for metal debris, check bearing condition, test oil pressure and confirm whether Jaguar 3.0 engine rebuild or replacement is the safest route. |
| 02 |
Low oil pressure / oil pump and pick-up concerns |
Red oil pressure warning, tapping noise, rattling, cutting out, hot idle oil pressure drop or rapid internal engine damage. |
Weak oil pump performance, blocked oil pick-up, sludge build-up, worn crank bearings, incorrect oil grade or oil starvation after extended service intervals. |
Carry out mechanical oil pressure testing, inspect sump and pick-up, check crank and bearing condition, and only restart the Jaguar 3.0 engine once lubrication health is confirmed. |
| 03 |
Timing belt / rear fuel pump belt failure on Jaguar 3.0 diesel engines |
Engine cranks but will not start, poor compression, misfire, rattling, sudden cut-out or valve-to-piston damage. |
Overdue timing belt service, failed tensioner, worn idler, water pump-related belt wear or rear fuel pump belt failure on 3.0 TDV6 / SDV6 diesel engines. |
Inspect front and rear belt systems, check timing alignment, test compression and assess cylinder head, valve and piston damage before quoting repair, rebuild or replacement. |
| 04 |
Turbocharger / twin-turbo boost control faults |
Whistling, siren noise, black smoke, limp mode, poor acceleration, restricted performance warning, under boost or over boost fault codes. |
Worn turbo bearings, actuator faults, carbon build-up, oil feed restriction, split boost pipework or boost control failure on Jaguar XF, XJ and F-PACE 3.0 diesel engines. |
Diagnose live boost pressure, inspect turbo shaft movement, check actuators, smoke-test boost pipework, verify oil feed condition and replace or rebuild failed turbo components. |
| 05 |
EGR valve / EGR cooler failure on Jaguar 3.0 TDV6 and SDV6 engines |
Rough idle, hesitation, coolant loss, white smoke, EGR fault codes, poor throttle response or failed emissions-related running. |
Carbon build-up, stuck EGR valve, blocked EGR passages, cracked EGR cooler or internal coolant leak feeding exhaust gases back incorrectly. |
Pressure-test the cooling system, inspect both EGR valves and coolers, clean or replace affected parts, clear fault codes and retest running quality. |
| 06 |
DPF blockage / failed regeneration on Jaguar 3.0 diesel engines |
DPF warning light, limp mode, frequent regeneration, high fuel use, reduced performance or exhaust back-pressure faults. |
Short journeys, failed regeneration, faulty DPF pressure sensor, injector issues, boost leaks, EGR faults or excessive soot and ash loading. |
Run diagnostics, check soot load and pressure readings, repair upstream faults first, then clean, regenerate or replace the DPF where required. |
| 07 |
Injector / high-pressure fuel system problems |
Hard starting, diesel knock, misfire, rough running, smoke, poor economy, fuel pressure faults or restricted performance mode. |
Worn injectors, leak-off imbalance, contaminated diesel, low rail pressure, high-pressure fuel pump concerns or incorrect injector coding. |
Carry out injector leak-off testing, check rail pressure, inspect fuel filter condition, verify injector coding and replace faulty injectors or fuel system components. |
| 08 |
AJ126 3.0 supercharged V6 timing chain / tensioner faults |
Cold-start rattle, metallic chain noise, engine management light, cam/crank correlation faults, poor running or timing-related misfire. |
Worn timing chains, weak hydraulic tensioners, guide wear, poor oil pressure to the tensioner or stretched timing components on the Jaguar AJ126 3.0 V6 supercharged petrol engine. |
Inspect timing data, listen for cold-start chain noise, confirm cam/crank correlation faults and assess whether timing chain service, engine repair or replacement is required. |
| 09 |
AJ126 supercharger / charge-air system faults |
Rattle from the supercharger area, poor throttle response, reduced power, boost faults, coolant smell or high intake temperatures. |
Supercharger snout or coupler wear, charge-cooler coolant leaks, intercooler pump faults, split intake hoses or air leaks on Jaguar F-TYPE, XF, XJ and XE S 3.0 supercharged engines. |
Inspect the supercharger drive, check charge-cooler circuit operation, pressure-test intake pipework, scan boost data and repair the failed boost or cooling component. |
| 10 |
Cooling system / water pump / thermostat failure |
Low coolant warning, overheating, coolant smell, puddles under the vehicle, steam, heater issues or white smoke from severe overheating. |
Water pump wear, thermostat housing failure, cracked coolant pipes, radiator leaks, expansion tank faults, EGR cooler leaks on diesels or charge-cooler issues on AJ126 petrol engines. |
Pressure-test the full cooling system, locate coolant loss, repair the failed component, bleed correctly and check for head gasket, cylinder head or internal engine damage. |
| 11 |
AJ30 / AJ-V6 3.0 petrol ignition, oil leak and inlet faults |
Misfire, rough idle, hesitation, engine light, P0300-style misfire codes, oil smell, oil in plug wells or poor low-speed running. |
Ignition coil failure, worn spark plugs, rocker cover gasket leaks, oil contamination around coil packs, vacuum leaks or inlet manifold issues on Jaguar S-Type, X-Type, XJ and early XF 3.0 petrol engines. |
Read misfire data, inspect coils and plug wells, replace failed ignition parts, repair oil leaks, smoke-test the intake system and confirm smooth running after repair. |
