Question about 2002 Jaguar X-Type
P0171 and P0174 are both lean fuel mixture codes, one is cylinder bank one and the other is cylinder bank two. This means means you have a common lean fuel condition for the engine when both cylinder banks set this code, this is NOT and indication the O2 sensors are defective. here is a list of the possible causes, each must be checked, it requires special tools that include live data scanner tool and fuel pressure testing equipment, with these code i do not advise guessing, the dealer should get involved in this or a trusted outside shop than has Jaguar testing equipment.
Combustion engines operate by burning an air/fuel mixture of about 14.7/1 (14.7 parts air/1 part fuel). When the air ratio goes above 14.7 parts, this is called a “lean” mixture, and if the air drops below 14.7 parts it is called a “rich” mixture.
Lean Mixture = Too much air, not enough fuel
Rich Mixture = Too much fuel, not enough air
Posted on Feb 02, 2010
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Posted on Jan 02, 2017
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