Question about 2003 Jaguar X-Type
Check engine soon light
Posted by Anonymous on
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Posted on Jan 02, 2017
P0174, refers to a lean condition of the engine....Possible causes would be a vacuum leak, clogged fuel filter, or a leaking intake gasket( this is the most likely cause because Jaguar has a service bulletin on this very issue). P0105, refers to a MAP sensor malfunction which could also be causing the P0174
Posted on Aug 20, 2008
SOURCE: p0171 and p0174 codes
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
Good old case of leaky air intake tube.
The air flow meter read the temp and air density to the computer ECU but the leaky air tube (between air flow meter to intake spot on the engine ADD A LOT MOVE air and offset the temp.
So you engine ECU see on set of info and the ACTUAL air density and air temp. are different.
SEAL the tube the best you can.
Vacuum leak can also show the same symptom.
Posted on Jul 16, 2009
these are lean codes. 171 is system too lean bank 1 and 174 is system too lean bank 2. what this relates to is you probably have a vacuum leak. look under for signs of obvious breaks in vacuum hoses. this is your most likely culprit. happy holidays
Posted on Dec 30, 2009
SOURCE: My check engine light is
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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System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
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