Question about 2000 Jaguar S-Type

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Codes P0171 , P0174, P0420

I have S tyep, 00 , 3.0L that cus off randomly and on evrey stop sign. spark plugs changed, down to the oil . I had it scaned and three codes show up , P0171, P0174 and P0420 . the michanic says that mostly they are related but he could not tell what is the cause of the problem.
help please and thanks

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  • townmark Nov 21, 2009

    need a solution for code P0420 on an s type jaguar 2000

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  • Jaguar Expert
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If the car stops when you are idling and then starts and drives with no visible problem, you have probably got a leaking inlet manifold or air hose - normally to the rear of the engine. To check this spray detector spray around the inlet manifold or top air hoses as the car idles or starts to hesitate, the spray will alter the air leak and the engine note will change. This is a very common fault on older jags.
see earlier examples in fixya.
hope this helps - good luck.

Posted on Nov 24, 2009

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  • Jaguar Master
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Has he chkd for a throttle positio sensor or a defective mass air flowf sensor?Is there a loss os power when it is running?

Posted on May 20, 2009

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Posted on Jan 02, 2017

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The recommended repair for both the P0171 and P0174 codes is to clean the MAF sensor. Ensure you use the proper cleaning solution, as there are many that will damage the sensor. Buy a cleaner that is made specifically for MAF sensors. The P0420 code will probably clear up if the MAF sensor clears the other two codes.

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code p0171 refers to system to lean bank 1==causes intake /exhaust leak--AIR system--MAP/MAF sensor--fuel pressure/pump--injectors--HO2s Have a fuel pressure test done on the fuel manifold to check for blocked filter/faulty pump/fuel pressure regulator faults
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P0420 p0171


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2003 Ford Ranger 4x4 extended cab- diagnostics checked and got these codes- P0171, P0174, P0300, P0316. Can you tell me what they mean?


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For these 2 codes, try cleaning the maf sensor (mass air flow), that is mounted in the big black hose that goes from the air filter housing to the throttle plate, if it is dirty, that will cause those 02 sensors to send a signal to the computor to lean the air fuel mixture. If cleaning it doesn't work, the sensors will probably need changing.
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On those 2 codes, you have to do some testing to find out why there is a misfire.
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