I'm looking at purchasing a 2006 X-Type Wagon for sale local to me. It's in fantastic shape and good price, but it has a cylinder 2 Misfire.

Codes are P0302, P1316, P1314, and P0037

Compression on cylinder 2 is good, owner states they replaced the fuel injector on that cylinder with a used one from a parts car (so could also be nonfunctional), changed the spark plugs and moved the coil.

But the weird part is: when driving, if you're floored, it has brief 5-10 second intervals where it runs absolutely perfectly. Also, according to the owner, when the low fuel light comes on, the car runs perfectly until you put gas in it again.

Kinda has me stumped, any ideas? I was thinking possibly ECU since I know that's a common failure

 

Fix the P0037 and see if the other goes away.

It's not common at all. Very last suspect.

 

Does P0037 not refer to the bank 1 downstream O2 sensor? Considering it's the downstream, and on the opposite bank to the misfire, I don't personally see the correlation.

Although after going and test driving it, After shutting the car off, and going to inspect the front RH corner brakes, I heard a faint hissing sound, almost like a vacuum leak, just for about 10 seconds after shutting the car off. I also learned that her husband changed a coil on the rear bank, and didn't change the Plenum gasket, IMRC O-Rings, or lower intake gasket while he was there, so I'm kinda leaning toward an intake leak above cylinder 2.

Honestly the car drove pretty fine ignoring the misfire, interior is in great shape, the Nav/Climate control unit don't work with error code C1, but that's minor. May end up purchasing it anyway and figuring it out later

 

As an update, I did end up purchasing the car. Love it so far, was able to track down the fault to two cracked spark plugs and a dead ignition coil, coil is on order and should arrive later this week. Thankfully no intake leak (this time, and/or yet)


I was even able to get the Nav/Climate control working. Thanks again for the help!