Diesel Exhaust Fluid Level

WARNING: This page is about a different car, the 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.

The level of DEF in the tank is checked using the Instrument Cluster (IC) menu. When selected the message center displays the approximate amount of DEF remaining, providing an estimated km/miles figure remaining, prior to emptying the tank

The DEF tank contains a combined temperature/ultrasonic level sensor. Circuit continuity and plausibility of the signals received are checked within the ECM. An ultrasonic "no echo malfunction" is set if no valid echo from the ultrasonic sensor is detected during a predefined time. This typically happens when the ultrasonic signal of the sensor is blocked, or if the DEF tank is overfilled (the air pocket at the top of the DEF tank is no longer present). The vehicle message center display's an advisory/warning system, which activates in low DEF conditions. If no corrective action is made, the engine will eventually not restart. The stages in the warning system are listed in the following tables

NOTE: None of the listed stages will activate the Malfunction Indicator Lamp (MIL). The stages are automatically cleared if the DEF level is increased

STAGES	CAUSE	WARNING	MESSAGE	DESCRIPTION
Stage 1	DEF range <1500mls/2400km	Message at engine start	Low Diesel Exhaust Fluid	The DEF is running low. Fill DEF at the earliest convenience The volumes of DEF are consumption and DEF tank geometry dependant
Stage 2	DEF range <940mls/1500km	Amber symbol	Refill Diesel Exhaust Fluid	The DEF is running low The volumes of DEF are consumption and DEF tank geometry dependant
Stage 3	DEF range <515mls/830km	Amber symbol	No engine restart possible soon. Diesel Exhaust Fluid	The DEF is running low. Fill DEF immediately or engine will not start The volumes of DEF are consumption and DEF tank geometry dependant
Stage 4	DEF range <100mls/160km	Amber symbol	No engine restart possible soon. Diesel Exhaust Fluid	The DEF is running critically low. Fill DEF immediately or engine will not start The volumes of DEF are consumption and DEF tank geometry dependant
Stage 5	DEF range <0mls/0km	Red symbol	No engine restart possible	The DEF tank is empty. Fill DEF to the minimum restart level condition The volumes of DEF are consumption and DEF tank geometry dependant