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Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 15555
Experience:  12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.
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2003 Jaguar xtype 2.5 liter, code po171 lean bank 1,po174 lean

Customer Question

2003 Jaguar xtype 2.5 liter, code po171 lean bank 1,po174 lean bank 2,p1111 controled fuel & air metering,p1000 controled fuel &air metering aux emissions control . Could you please help guide me in the right [email protected]
Submitted: 7 years ago.
Category: Jaguar
Expert:  Richard replied 7 years ago.

Hello and welcome to


The most likely cause of the rough running and lean codes are a collapsed PCV tube, leaking brake booster hose or a leak from the IMT seals. Listen for a hissing noise at idle from the right side of the intake. If you hear this then those two IMT valves need to be removed and the seals replaced. Also inspect that PCV and booster hose.