Will driving while the car says "restricted performance" harm the vehicle. There is already a known problem with the MAF (Mass air flow). I think the problem is a dirty air flow sensor.

 

The error codes are 171, 174 and 1111

 

171 and 174 are lean bank codes, both sides indicate an unmetered air leak.
Things to check...
MAF connection to induction tube.
Induction tube to throttle body, take the tube off and check for cracks/holes.
Seals both at MAF & throttle body.
Clean the MAF sensor, unscrew the 2 screws and remove. Spray and flood MAF cleaner onto the MAF bulb that's protected by plastic, a q-tip if particularly grubby.

Carry out a 'hard reset' once you've done this and see if the restricted performance goes away.

 

Thank you for the information. I am out of town at the moment. Will my car be damaged if I don't do the maintenance immediately? I am currently using the car on my trip. 8+ hours of hard driving ahead.

 

The ECU is on back up mode for the restricted performance. But if you are doing hard driving then you must know that the Restricted Performance mode will not let you go above 3000 rpms...

 

it is probably fairly miserable trying to drive the car in restricted performance, I had that some years ago (replaced the throttle body and all was cured) and was limited to a maximum of 15 mph.

Driving it in restricted-performance should not do any harm, BUT whatever is causing the restricted performance could increase damage by driving it - depends what is the cause of the issue. If it were me, I'd just keep driving it until convenient to fix.

 

I've been chasing the same pair of codes, it's been discussed in this thread here: https://www.jaguarforums.com/forum/x...-codes-180753/

Hopefully you'll get it sorted and it won't cause you too many problems.