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Thursday, April 3, 2014

P0442 on your Jaguar X-type

P0442 is caused when the computer sees a leak in the fuel tank system. By law, the gases that form in the fuel tank from gasoline being there and shaking as you drive up and down cannot leak to the atmosphere that we all share and breathe. So Jaguars have what is called an EVAP system, who's purpose is to get all these gases, store them in a tank (called the charcoal canister) and feed them to your engine so the gases get burned properly. So as you drive down the road the computer is always using this system components to check for leaks. This code means that the computer sees a leak.

So these are the possible causes:
  1. MOST LIKELY: Bad gas cap (they go bad all the time so what you do is buy a gas cap from the following link and clear the codes, that will most likely fix your problem). Link: 10851 Fuel Cap
  2. The neck or any hoses going to the fuel tank. For these I recommend a leak but I can happily tell you that I never had a problem with these in all the years that I've been working in Jaguars.

P0441, P0443, P0444 and P0445 on your Jaguar X-type

P0441, P0443, P0444 and P0445 on your X-type is flagged when the computer sees that the circuit for the purge valve is not operating properly. The first thing to check would be to put your hand on the purge valve and feel that it is clicking. Is not supposed to be clicking 100% of the time, but just run the car, let it idle for about 2 minutes or so and then feel if the valve clicks, if it doesn't you most likely need a new one. Other things you could check at this point, if it does click, is make sure the valve is not plugged up. Take it out and make sure is clean. Then you can add power and ground to it and blow through it (eww I know) and then take the power and ground out and blow through it and see if it is operating properly. If it is working properly check for vacuum at the hose that connects to the valve. If you don't have vacuum then follow the hose and see why you don't. You can also check the resistance of the purge valve, is supposed to be between 30 ohms and 35 ohms at room temperature.

Buuuuut, your most likely problem is a purge valve.

Tuesday, April 1, 2014

P0420 and P0430 on you Jaguar X-type

P0420 and P0430 on you X-type means that the computer sees something wrong with your oxygen sensor readings. P0420 is for bank 1 which is the bank towards the back of the car and P0430 is bank two which is much easier bank at the front of the car. There are two oxygen sensors per catalytic converter and two catalytic converters so you have a total of four oxygen sensors. The computer compares the upstream oxygen sensor (before the catalytic converter) signal with the downstream oxygen sensor (after the catalytic converter) signal to make sure the cat is doing what is supposed to be doing, reducing emissions. So these are the possible causes:

Most likely (in this order):
Not likely but possible:
  • Bad wire between the computer and the sensors
  • Bad computer
So what do you do? If you haven't replaced the oxygen sensors already I would do that first, because they do go bad and new sensors show small improvements in fuel economy. I would change them first try the upstream (because is closer to the engine and works harder), then the downstream.If that doesn't work you might want to try and exhaust shop because the Jaguar original cat is really expensive. 

Friday, March 28, 2014

P0351, P0352, P0353, P0354, P0355 and P0356 on your Jaguar X-type

The codes P0351, P0352, P0353, P0354, P0355, P0356 are flagged when the computer sees a problem with the coil circuit. You probably not have all six of them so here is a little map to help you identify what coil(s) are giving you problems.


The last digit on the code indicates what cylinder is at fault. For example, P0354 would be cylinder 4 coil. To fix these codes you most likely need to replace the respective coil. Also when I replace only one coil I also like to replace the spark plug if it hasn't been replaced. This is because old spark plugs make the coil work harder. If one coil went out that means that the rest are coming, so you might want to consider replacing all six coils and spark plugs and be done with it. I know money is tight so changing just one is ok.

Here is a link to the coil:Jaguar CLS1153


Best of luck!

Thursday, March 27, 2014

P0340 and P0341 on your Jaguar X-type

P0340 and P0341 in your Jaguar X-type are flagged when the computer sees something wrong with the right hand bank Camshaft Position Sensor circuit. Wires seldom go bad so your most likely problem is your camshaft position sensor.

Here is the link if you just want to buy the sensor and not read anymore: Standard Motor Products PC467 Camshaft Sensor



There are two other possible causes for this code, in the rare case that this doesn't fix your problem. The computer or a wire between the computer and the sensor. If you unplug the sensor you can measure the resistance between the pins at the connector for the sensor and if you see some sort of resistance then the wires are most likely in good condition. 

Tuesday, March 25, 2014

Jaguar battery drain

So you've got a battery drain... well don't feel so bad today and many times I got one kicking my behind too! So today I decide to start this article today and I will improve it and keep adding information as I do more battery drains on these cars and hopefully create a good reference for others with the same problems.

First off this is what the drains are supposed to be according to specifications by Jaguar literature:

  • XJS 3.2L: less than 30 mA after 1 hour
  • Sovereign 3.2L: less than 37.3 mA after 1 hour
  • XJ6 4.0L: less than 38.6 mA after 1 hour
  • XJS: less than 43.9 mA after 1 hour
  • XJ6 (X300) '95 MY: less than 43 mA after 1 hour
  • XJ8 (X300): less than 30 mA after 1 hour
  • XK8 (X100): less than 30 mA after 1 hour
  • S-type (X200): less than 30 mA after 1 hour
  • X-type (X400): less than 30 mA after 30 minutes
  • XJ6 (X350): less than 30 mA after 40 minutes
  • XJ8 (X350): less than 30 mA after 40 minutes
  • XK (X150): less than 30 mA after 3 minutes if locked and after 33 minutes if unlocked
  • XF (X250):  less than 30 mA after 3 minutes if locked and after 33 minutes if unlocked
  • XJ (X351):  less than 30 mA after 3 minutes if locked and after 33 minutes if unlocked

Knowing these is a good place to start, but I learned that they are not very accurate. So (lucky me) there were to XJs in my shop that day, one with the battery drain problem and one completely unrelated. So I was able to test the battery drain on the good known Jag and compare it. So I decided to start testing the battery drain in good known cars for when I have the problem I know EXACTLY how they are supposed to behave. Here are my findings (check back because I am planning of testing hopefully every type of Jag):

I did a battery drain test on good known cars. The way I did it is I unhooked the battery negative side terminal and hooked a DMM in series and press record (my meter is expensive as he** so it can record ok?!) So now with the cars I tested I can tell you what the different current was at different times. I did and will continue to do these test only on cars with no aftermarket equipment. If you have aftermarket equipment then unplug that first.

1998 Jaguar XJ 4.0L N/A
As soon as you hook up the meter you get about 1.9 Amps which drops quickly to about 250 milliamps and remains like that for about 15 minutes. Then it drops to about 48 milliamps in the next three minutes and it drops steadily to about 27 milliamps for the next twelve minutes.

2001 Jaguar XJ 4.0L N/A
As soon as you hook up the meter you get about 1.6 Amps which drops quickly to about 1 amp and then drops steadily for 15 minutes to about 0.8 amps. In the next 5 minutes it drops quickly to about 30 milli amps and stops dropping at 30 minutes.

Thursday, February 13, 2014

P0335, P0336, P1245 and P1246 on your Jaguar X-type: Crankshaft position sensor

P0335, P0336, P1245 and P1246 are flagged by the engine computer when it sees a problem with the Crankshaft position sensor. The crankshaft position sensor is used by the computer in conjunction with the camshaft position sensor to fire the right spark plug at the right time and activate the right injector at the right time. In other words, you need it for you engine to run. So if one of this codes is on your computer, and most likely your engine is not staring, then you need to install a brand new crankshaft position sensor.

Here is the part number: XR829578

In the weird case that this doesn't fix your problem (highly unlikely), then the problem is most likely your computer, because wires seldom go bad.