Symptom Chart

WARNING: This page is about a different car, the 2015 Jaguar XF, 2014 Jaguar XF, and 2013 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM	POSSIBLE CAUSES	ACTION
All engine related issues	Engine system fault	Using the manufacturer approved diagnostic system, check the engine control module for related DTCs and refer to the relevant DTC index
Poor starting - Engine hot or cold	Cylinder compression (s) low Spark plug (s) fouled	Perform a compression test (refer to component tests in this section) Check the condition and color of the spark plugs
Poor idling	Air intake system leak Cylinder compression (s) low Valve clearances incorrect Spark plug (s) fouled Exhaust system restricted or blocked	NOTE: A vacuum gauge check may aid fault diagnosis (refer to component tests in this section). Datalogger signal(s) for Short Term Fuel Trim can be used to aid fault diagnosis: Readings up to 10% may be considered as acceptable Positive readings of between 10% and 20%: Check the air intake system for leaks Negative readings of between 10% and 20%: Check for over fuelling (for example, leaking injectors, high fuel pressure) Readings above 20%: Check for DTCs and refer to the relevant DTC Index Check the air intake system for leaks Perform a compression test (refer to component tests in this section) Check the valve clearances and adjust as necessary Check the condition and color of the spark plugs Check the exhaust system, including the catalytic converter, for restrictions and blockages
Insufficient power/compression	Air intake system leak Cylinder compression (s) low Valve clearances incorrect Spark plug (s) fouled Exhaust system restricted or blocked	NOTE: A vacuum gauge check may aid fault diagnosis (refer to component tests in this section). Datalogger signal(s) for Short Term Fuel Trim can be used to aid fault diagnosis: Readings up to 10% may be considered as acceptable Positive readings of between 10% and 20%: Check the air intake system for leaks Negative readings of between 10% and 20%: Check for over fuelling (for example, leaking injectors, high fuel pressure) Readings above 20%: Check for DTCs and refer to the relevant DTC Index Check the air intake system for leaks Perform a compression test (refer to component tests in this section) Check the valve clearances and adjust as necessary Check the condition and color of the spark plugs Check the exhaust system, including the catalytic converter, for restrictions and blockages
Oil consumption high	Engine oil leak Engine wear	Check for engine oil leaks Perform an oil consumption test (refer to component tests in this section). If the oil consumption is excessive: Check the integrity of the engine breather system Perform a compression test (refer to component tests in this section) Check the condition and color of the spark plugs
Engine noise	Engine component failure	Refer to the Special Service Messages on the Electronic Product Quality Report (EPQR) system for sound files. If the symptom does NOT compare to any of the sound files, contact Dealer Technical Support (DTS).