Hi All!

This one is stumping me. Car goes into restricted mode, with an open circuit injector 1 issue. Here are the facts:

Happens at 140 degrees F like a clock.
After car is warmed up (over 200) NO ISSUES.
Replaced both upstream and one downstream cat.
Fogged intake, no leaks.
Runs smooth as silk when warmed up, idle is a little rough when cold.

I am all out of ideas. Looking forward to some theories or resolutions- thanks in advance!

 

If your observations are correct, I would start looking into electrical connections at the injector and the coil down to when harness leaves engine. If you have access to scope, you may want to try to see if you have a wafeform change while engine heats up.

 

I suspect it was not the cats but the lambda probes that were changed. That was not wrong depending on the mileage, the probes are a wearing part.
It may be that it is a cable or ground problem, you can measure to find out. Would be helpful if you state the exact DTC's here.

Fritz

 

Point taken-

Code is P0201
Happens at EXACTLY 132 degrees, if cleared will return all the way to 203 degrees. Like a clock. Then no codes or restricted performance. Its like two temp sensors aren't jiving and the car throws a code but then once it hits operating temp all is well.

 

New data point:

Ambient Temp.

This am outside temp was about 60 degrees=CODE/Restricted mode
Went to work, came back out, outside temp- 70 degrees, engine cold(ish) definitely below 140. =NO CODE

hmph.

 

The Jaguar details on P0201 are in this thread's (AJ3X ...) PDF(s)

https://www.jaguarforums.com/forum/s...t-code-266729/

Nothing to do with cats, O2 sensors, etc AFAIK

 

DTC P0201 can be a fault on the injector itself or on the circuit. To clarify this I would replace the injector from cyl. 1 with another from e.g cyl. 2. If the error is migrating, i.e. the DTC is P0202, the injector is most likely the problem.
If after the exchange the error is still P0201, there is a cable problem. The WSM contains pin point tests for measuring the supply voltage, resistors, continuity tests and ground faults.

So you need a little knowledge of automotive electronics, a multimeter and a WSM. The pages from the WSM I could post here, but complete download of a X350 WSM can also be found on the net.
Don't think the outside temperature dependence is helpful at this stage.

Fritz

 

Good points. I ordered replacement injectors and will install/report back next week the result. Looks like maybe the injector is leaking, and the monitor is kicking back a problem.

 

To close this out and hopefully help others: I unplugged and replugged the ABS connector a few times and RP did not come back. Nada. No more lean misfire codes, no more restricted performance, passed smog. I did not do anything else to the car but this. Not sure how they are connected, but they are.