Hey fellow X-type owners,

A few months ago my X developed a P0352 code.
Time for new coils and spark plugs, so the garage changed all 6 of them.
A few weeks later the car gave again the P0352 code, and P0302 code with a flashing engine light.
So i can't drive any further if i don't want to destroy my cats.

What else than coils and spark plugs could be responsible for these fault codes?
To be sure, i changed the coil of cylinder number 2 again, but that did not help.
I did check the wiring of the coil of cylinder 2, but i can't see any damages there.

I can drive the car let's say 50 miles from a cold start, but after that or even a longer drive the P0352 and P0302 start to pop up (car starts to misfire etc).
The misfires will stop, and after that i can drive again until it start misfiring again.
So i think i can say the problems start when the engine is hot, but never when cold.

I know there are quite some X-type owners over here so i thought i would give it a try on this from.

2006 2.1V6 X-type Estate.

Thank you!

 

Both your codes relate to cylinder 2.
> I did check the wiring of the coil of cylinder 2, but i can't see any damages there.
All I can think of: Check it again. Check wiring for intermittent shorts and intermittent disruption.
Also, check all connection points for corrosion.

PS: Some kind of control module may possibly be also at fault...

 

Thanks for your reply.

I tested the plug of coil cylinder 2 by wiggling the wires when the engine was running to see if it started to misfire, it didn't.
Wire loom looks fine, what can i check further at the wires that you know of?

Can these misfires also be the cause of a leaking intake gasket of cylinder 2 you think?
Weird thing is, it never misfires when cold, only after engine is fully warmed up.
If it's a damaged wire, it should be doing it all of the time i guess, cold and warm?
Somehow it looks like "something starts to leak" when the engine gets hot causing misfires.

Other possibility is maybe a bad injector of cylinder 2?

 

Riešim niečo podobné. Tiež my to vyhadzuje tieto chyby ale len na jednej polovici motora V6. Dal som nové sviečky,cievky. Skontrolovali čidla na vačkovom hriadeli. Problém sa ukazuje hlavne pri minus teplotach. Motor po 30 sekundach od štartu vyhodí chybu. Vtedy keď vypne sytič. Dlhším badanim som dospel k tomu,že chyba bude v kyslikovej sonde. Jednu sa mi podarilo vyčistiť a problém skoro zmizol. Ešte motor nejde na 100% ale tak na 98%.

 

Red X, I can't answer your questions.

I just read the reply from Taurus. I think, Taurus forgot to hit the translator button...

But I think this reply might help you, though - I remember that he had recently a similar question/problem.
I put his reply into the Auto-translator, but a lot of nonsense came out there, too. Thus, I asked my wife to assist me (she speaks Slovak, but she does not know the name of car-parts).

Thus, here I used the auto translation as basis, corrected those sections, which were wrongly translated, and left out those sections, which did not make sense, as my with did not know the terminology of the car parts:

>>>>>>>>>>
I've solved a similar problem. We received the same error codes, but only on one half of the V6 engine (= one on one bank). I put new spark plugs in and new coils. The problem shows mainly at minus temperatures. The engine throws error-codes after 30 seconds from the start. After long consideration, I came to the conclusion, that the problem's source is the oxygen sensor. I managed to clean one and the problem almost disappeared. The engine is not yet 100% but about 98%.
>>>>>>>>>>

Actually, when I read the post of Taurus, I finally remembered, which one his post is:
https://www.jaguarforums.com/forum/x...sensor-294935/

 

Allright... thanks for the help and translation :-).

When the car is commissioned back from Germany we will take a look at it.
I'll report back here what we have found.

Thanks!

 

A failing fuel pump can cause misfire codes. I learned this the hard way after replacing coils and plugs and still having misfires until the day the fuel pump totally died.

From the OBD code manual for the X Type:

 

Thanks for the input so far guys.

Allright, update:

The misfires were caused by the new spark plug of cylinder number 2.
I changed the spark plug once again and the misfires has stopped so far.
I also changed the intake for a refurbished intake with refurbished injectors, seals etc from a well known Jag specialist over here.
After that it throws P0172 and P0175 codes, i never had these with the old intake.

So where to look now?
It probably has to do with the new intake, but why?
I changed the MAF, but still have the codes.

Could it be a vacuum leak?
I read at some places if it is a vacuum leak i should have lean codes, not rich codes...

Thanks again.

 

The OBD manual for the X-Type says these codes are the result of:
1) bad/clogged air filter
2) leaking fuel injectors
3) fuel pressure too high/fuel pressure sensor failure
4) bad signal from MAF, coolant temp sensor, throttle position sensor, fuel pressure sensor,...

Could be as simple as your shop forgot to plug in the fuel pressure sensor so the computer keeps the fuel pump on at all times. If you have access to a code reader that shows real time data I would look at the fuel pressure first. It should be very constant around 50 psi (~350kPa). You can also look at coolant temp and some others this way, if the readings reported out to the OBD are reasonable you can eliminate those sensors as problems without even getting your hands dirty.

Probably not leaky injectors if it is a reputable shop and it is happening on both banks.

 

-Air filter recently changed
-Fuel injectors all overhauled
-MAF changed, no difference

-Fuel pressure could be suspect, the car feels overall a bit slow, it is a 2.1 though.
-Coolant temp sensor, possible
-Throttle position sensor, possible
-Fuel pressure sensor, possible (where is it on a 2.1?)

Only thing that's bugging me is i did not have a rich situation, and codes, with the old intake.
I only had the misfire codes for cylinder 2.

Could a vacuum leak cause this rich situation?
Usually a vacuum leak cause a lean situation.

Thanks allot .

 

I don't know anything about the 2.1L but on the 2.5 and 3.0 the fuel pressure sensor is on the end of the injector/fuel rail nearest the transmission. Referred to in the manuals as fuel pressure sensor, injector pressure (IP) sensor, fuel rail sensor, probably more. The sensor has a vacuum hose connection to the intake manifold because the computer is trying to maintain constant fuel pressure compared to intake vacuum pressure. If that hose is not attached or is leaking you would get high fuel pressure due to the "reference pressure" being atmospheric pressure instead of vacuum.

This is what it looks like on my 3.0L.

 

I think this pressure sensor is also on the 2.1.
I will dig into that, especially being the vacuum hose as suspect.
Thanks!

 

I would love to find where that sensor is on the 2.1. I can't seem to find it....

 

Oh, just found out: 2.1 motor vehicle doesn't have the Fuel Pressure Sensor on the fuel rail. Fuel pressure is monitored by the fuel pump. Bugger! No bloody wonder I couldn't find it, and AI answers are crap.

 

It was just an hallucination