Question about Jaguar XJ8

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My check engine light is on and I get the following three (3) service codes: P0171 P0174 P1000 Please tell me what is the problem!! Al Frazier alfrazier99@yahoo.com

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The PO174 & PO171 go hand in hand. There is a lean fuel to air mixture. A disconnected vacuum line or if it has a hole in it. Check all lines make sure they are all connected and are in good condition. Air filter and air passages should not be blocked or dirty. The EGR differential pressure sensor might be bad. If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors. Usually a vehicle with 60,000 miles or more.Hope this has helped give you some possible cause to look at. Happy motoring!

Posted on Mar 20, 2011

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I would say that P0171 and P0174 is probably a vacuum leak so check all your vacuum hoses, (listen for any hissing). The P1000 code I think means that the engine managment system checks have not been completed. It might go away when you find the leak in the vacuum pipes.

Posted on Mar 20, 2011

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2001 GMC SIERRA 1500 4X4 CODES P0171 AND P0174 CHECK ENGINE LIGHT IS ON WONT PASS EMISION


Sometimes this is NOT a O/2 sensor issue ,,,,,If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.
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2004 x-type 3.0 v6 152,000 miles showed codes P0171, P0174, P2096, P2098, P0101, P0171 pd, P1000.


check for vacuum leaks or a faulty mass air flow sensor. all the codes have to do with engine too lean(too much air).

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I have a 2001 Jimmy with "Service Engine Soon"


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Last time you changed your fuel filter?
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1 Answer

What is the code P1451 solution? Runs great, codes P1451, P0171 and P0174 are coming up and the engine light is on. Car needs to get inspected but codes need to be fixed.


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