First time posting here. My girlfriend's car, which is a '00 ZTS Focus, starting sputtering and missing a while back and we didn't know what was happening. Then it gave the engine light a few days later which was the P1131 code. I was wondering what the "usual" suspects were for this code. The problem occurred out of nowhere. The symptoms of it are a higher than normal idle rpm, lot of engine noise (ticking), sputters any time on the gas, and bogs down while accelerating softly but seems to clear up a bit while getting on the throttle. It's her daily driver so hoping I can fix it without having to drop it off at the shop for a couple of days.