Question about 2002 Jaguar X-Type

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P0171 and p0174 codes

I have a p0171 and a p0174 code...someone told me it is usually upper to lower intake gaskets? chuck

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P0171 System too Lean (Bank 1)
P0174 System too Lean (Bank 2)

If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. Excessive oxygen readings in the exhaust will set lean codes. This does not mean that the oxygen sensors are defective. It is a common mistake for people to replace oxygen sensors when lean codes are present. Just because the code is related to oxygen sensor readings, it doesn’t mean that the oxygen sensors are bad. If both of these codes are stored this means that both banks of the engine have excessive oxygen in the exhaust. If the oxygen sensors are replaced it’s most likely that the same codes will reappear. It is very uncommon for two oxygen sensors to fail at the same time.

Therefore the most likely cause of P0171 and P0174 codes is a vacuum leak. The source of a vacuum leak can be one of many things. The most common cause of a vacuum leak is a leaky hose. Vacuum hoses over time can become dry and brittle. The rubber deteriorates and can leak causing a vacuum loss. Many times a leaky vacuum hose can be found by listening for a hissing sound. A large vacuum leak can even make the car run rough at idle. In some cases it will not idle without feathering the gas pedal.

Posted on Sep 10, 2009

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What is 'upper' to 'lower' intake gasket?... Instead, you should have specified that both P0171 and P0174 are indicative of 'LEAN' fuel mixture... right? for BOTH banks!... right? This code means there are multiple possible causes... agreed? vacuum leaks, faulty MASS AIR FLOW SENSOR... faulty MAP (manifold absolute pressure) sensor -- OR the wiring between them!.. .ya think? Check em out.

Posted on Sep 10, 2009

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Free full online repair manual with everything you could need at www.autozone.com and free registration.

it could be gasket, vacuum hose, or similar. = air leak

Posted on Sep 10, 2009

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2000 mustang 3.8 has p0174 code. all vacuum lines components are good. was told to check intake manifold for vacuum leaks. since plugs are fouling same time as code p0174 appeared, as well as bad idle,...


Hey, that's pretty good logic. Why you asking us? Just the same, I would verify the gasket leak by spraying carb cleaner on the gaskets while the engine is running. If the speed changes, there is your leak. You will have to remove the upper manifold first anyway. Be careful not to tear up the gaskets when you pull the manifold off, so you can inspect to see where the leak was--validate the issue, you know. OK?

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The upper intake manifold gaskets and isolators (the bolts that hold the manifold down) leak and cause the p0171 and p0174. The reason they leak is due to a missing baffle in the front valve cover which allows some oil into the upper intake which swells the gaskets and wears them. The manifold gaskets and valve cover should be replaced. But before having this done check to see if the black plastic hose on the back of the rubber intake hose(between the throttle body and maf) has dislodged. This happens alot when a new air filter is installed and will cause the same codes.

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if you have the 3.8 liter its more than likely bad intake manifold gaskets or a cracked manifold. Ford has had several TSBs on this issue. O2 sensors do not go bad as often as mechanics say they do. I have a 1999 that after 100 dollars at the parts store solved all lean conditions on the top end. The manifold has three parts to it. A lower aluminum that houses the butterfly blades for the variable intake runners( known vacuum leak were rods protrude at passenger side of lower bad bushings likely cause). Middle riser which uses oring seals which dry out and cause major vacuum leaks. upper is more or less the top cover which uses one large oring to seal. Hope this helps!

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