what does code po153 on a 1997 jaguar xk8 thanks

 

Here you are:

P0153 :HO2S sense circuit slow response – B bank, upstream
Monitoring conditions:
Engine at normal operating temperature; a drivet 50 – 62 mph
engine speed 1500 – 2500 rpm>10 seconds
Default Action:
When CK ENG MIL is activated (DTC flagged; second trip),
ECM:
– Inhibits B bank closed loop fuel metering
– Inhibits B bank adaptive fuel metering
Possible causes:
Engine misfire
HO2S disconnected
HO2S mechanical damage
HO2S to ECM wiring intermittent open circuit
HO2S sensing circuit short circuit to high voltage
HO2S short circuit to ground
HO2S ground (BRD – braided shield) open circuit
HO2S heater circuit fault
Exhaust leak
Low exhaust temperature
Injector flow partially blocked
Catalyst efficiency decrease
HO2S failure