Hi All,
I picked up a new (to me) 2016 F type Coupe V6S with about 57k miles. Higher mileage I know, but it is CPO with a warranty through next year so I felt fairly comfortable moving on it.

On my way home on the highway I popped a Check Engine Light (non-flashing). I brought my little bluetooth scanner with me for just such and occasion and the fault recorded was P0170. Generally this looks like a Fuel Trim Malfunction for Bank 1. It looks like this indicates I'm likely running too lean or too rich, but does not clearly define which. Some of my quick searching suggests it could be a bad MAF or O2 sensor. The car seemed to run the same before and after the CIL came on. I noticed no misfiring or loss of power anywhere in the band.

Has anyone seen this issue in their 3.0? Note I watched the STFT a bit and generally it was +-5%, though occasionally dove to -10% under acceleration. I was unable to see the LTFT levels with the app I was running at the time.

Thoughts? I plan on getting it into the dealer for diagnosis, but they are booking 2-3 weeks out right now

Thanks!

 

What are the LTFTs and STFTs? Post them here. If the STFTs are below zero there may be a sticking injector.

Has any recent work been done to the engine?

 

Hi NBCat,

I mentioned the STFT in the post above. The app I'm using with the (cheap) bluetooth scanner didn't seem to have LTFT. I'll have to dig into it a bit more tomorrow to see if I can get that.

As far as I know no recent work has been done. It was serviced by a Jaguar dealer about a month ago.

 

Updated to Torque Pro and went out for a drive around the block. Looks like my LTFTs are spiking quite a bit. These seem kind of wacky, I wouldn't expect my LTFTs to swing this much...




Any thoughts on what this suggests?

Note at Idle my LTFT1 is around 8%:

 

Couple of things for you here. These can be caused by any slight air leak in the system anywhere. So I would start looking for hose or seal loose as the easiest place to start. Also, most common (if not a leak) are MAF (Oiled air filters?) or O2 (which these cars seem to eat).

On another note, be sure when you lock your car now that it actually goes to sleep, so your battery does not drain. I say that, because many who have used OBDII devices or readers (non JLR) have to reboot the battery afterwards, as it stays awake afterwards and drains battery, Just FYI.

Good luck,
DC

 

I've been poking around the forums for a bit - is there anywhere that has the engine diagram so I can start identifying the hoses to investigate? I am not particularly familiar with this engine yet.

Reference to any pictures pointing these areas out would also be super helpful! My first scan of the intake system did not show anything obvious.

 

Tried to share this with you from my Google Drive...Overview of V6 Engine. Hopefully it will work? Link here - https://drive.google.com/file/d/1__U...ew?usp=sharing
Give it a shot....it is 10 MB.

DC

 

I was able to download, thanks! Will be handy to have in general,

It sounds like they are honing in on the O2 sensors as the root cause of P0170. It surprises me they don't mention anything about he MAF or Vac leak.

Two weeks to get into the dealer... grrr.

 

Just checked my oil level (haven't run the engine in a few hours) and it says overfilled! Yikes! I wonder if that could be contributing to the issue (maybe dirtying up the O2 sensors?)

 

I had a similar issue on my MY '15. It turned out to be a failed soft line in the fuel system above the fuel tank which was not initially covered under CPO. I filed a claim with Jaguar as the car has just inched past the original warranty. They approved the repair under warranty. If I recall correctly, the repair would have cost over $1K as the tank had to be dropped to replace the line.

It could also be a faulty seal on the gas cap. They replaced that as well as a precaution.

 

Interesting, I'll mention that when I take it in. Don't think I can check that myself. Did check the gas cap, looks good.

I got an oil sucker-outer and pulled out about a half quart of oil, and got back to "OK" levels. Hoping that helps things in the long run (at least it wasn't a quart or more over).

 

As a notation, when you check the oil, make sure you're on very level ground. It doesn't take much to read high.
True overfills are more common on the V8's (in part because some of the early documentation was wrong).
It's not as common on the 3.0, but certainly can happen.

 

Thanks for the insight. For some reason I thought it was the 3.0 with the issue. Either way I did the test in my garage, which is quite level. Did it both shortly after a drive and after sitting overnight just to confirm.

 

I thought it was a RWD vs. AWD issue, because the AWD had a slightly reduced oil capacity. Maybe the V8 has something to do with it too, but with a V6 RWD, I didn't noted that there seemd to be an issue, and it didn't apply to me

 

Mine has been sitting for several days and the oil gauge reads right at the Max line but not overfilled. I’m assuming because it’s been sitting and not showing an overfill warning I’m ok?

 

Marko, No problem if at Max without showing a yellow overfill alert. The overfill issue occurred primarily with the AWD cars (both V6 and V8) that have a smaller sump capacity. Many dealers are still following erroneous guidelines indicating the same capacity for AWDs and RWDs alike.

 

Start with the hoses between the MAF and the inlet manifold. Sometimes the connections can become loose and draw in additional air that the PCM must adjust for, thus the high LTFTs.