Sounds like you’re hot on the trail.

Does the sensor also have a vacuum line? Strictly working from potentially faulty memory here, but I think some models use a vacuum signal to tweak the fuel pressure reading. In other words, under certain conditions, the sensor sends a deliberately misleading value to the PCM.

Look at post #11. It says you should see 3 bar (44psi) at idle and 5 bar (73psi) at Wide Open Throttle (WOT). Since your scanner is reporting a value consistent with WOT, that makes me go, “Hmmm.” If the sensor has a vacuum line, but it had a major leak, the lack of vacuum would trick the sensor to behave as if at WOT.

This might be worth investigating. Or maybe I’m out in left field (again) and 73psi is a normal value for a cold start.

 

I believe the sensor does have a vacuum line. I will take a look at it next time I inspect the engine.

 

If you would read my post and follow the link I also had a bad fuel pressure sensor and in my post I tell you how to test it.

Did you read the link yet??

No you can drive just fine with the sensor unplugged I did so until the part came in.

Again please read my link and my post. This has all been covered and documented in detail?
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My bad. I did see your link but didn't go through it in detail. I did look at the fuel rail diagram on your post and was trying to find the valve and couldn't find it. I'll read it now.

 

No problem and I was trying NOT to get on you. I just wanted to reduce the time it's taking to get your car fixed.

Now you can help the rest of us?
We don't know for sure if the 2006 and up STR's dropped the fuel pressure test port or not? Please report back when you get it all repaired.

Not sure why they would remove the test port but hey my newer Jag does not even have a engine oil dipstick any more!!
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At least the crankcase is not "sealed for life".

 

I appreciate all the info from this forum. As of what I see, I don't see any fuel rail valve on my 06. On the other hand, my fuel pressure sensor came and I'm going to install soon when I get the time. Will keep this forum updated. Thanks.

 

I had something similar to that also, lost power, any throttle would feel like it was getting to much fuel. For me it was intermittent. I finally was able to pull the code while it was happening, 191, we replaced the fuel pressure sensor and so far after a month no more problems.

 

Update: So I got the new fuel pressure sensor on and it started up. Here's the issue now. It ran really good for about 5-10 minutes and then started to lack power. It still can cruise around, but doesn't have the STR horsepower it normally has. I am drawing some codes after the 5-10 minutes of nice riding. p0087(Powertrain), p0193(Fuel Rail Pressure Sensor Circuit High Input), and p0174(lean bank 2). I believe the p0174 isn't related because I've had to fight that code in the past. My theory is that the aftermarket fuel pressure sensor isn't liked by the ecu. I just impulse bought an aftermarket one on Amazon with all 5 star reviews. If you guys agree with that. Can someone point me to the correct fuel pressure sensor? The one that came off of it was a ford part which I read works on them. Is the correct Jaguar part JA-AJ8-7977 and the Ford part 3R3E-9F972-AA? Thanks

 

The number in JPEC is AJ87977