PO171 + PO174


Asked by Jan 16, 2015 at 03:14 PM about the 2004 Jaguar X-TYPE 3.0

Question type: Maintenance & Repair

Hi everyone. I went for my inspection today and couldn't pass as the engine light came up. PO171 + PO174. Seems to be vacuum leak. Is anyone familiar how serious this could be and how expensive to repair? Thanks in advance smile emoticon

1 Answer


I pulled this off a Jaguar forum "Those codes mean that the engine is running lean on both banks of cylinders. A common cause of this is a vacuum leak. I had that, and solved it by changing the IMT o-rings, PCV hose, and brake booster hose. The only one of these parts that is somewhat expensive is the brake booster hose, which is around $100; the others are quite cheap. There are other possible causes, but these are common. I never did figure out which was the culprit in my case, I just changed them all and the problem went away. It took me less than an hour to do the job, and I am slow!" I have also heard that the leak is usally in the brake booster itself. Good luck

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