Ford Focus Engine light troubles?

I own a 2000 Ford Focus, and the engine light stays on, despite being maitenced for the cause 2 different times. I've spent nearly 700 trying to fix whatever issue is, I need this check engine light problem to be resolved due to smog. My mechanic thought the sensors were bad, so he replaced the oxygen sensor, the motor mounts, then transmission mounts, then spark plugs, then wires. After a while, he just told me there was nothing else he could do as the codes weren't adding up (cylinder misfire 4)

Right now, I really don't know what to do, any advice is appreciated thanks.

My '04 Ford focus makes a clicking sound when I turn the key, what could it be?

It's an '04 Ford focus, 4 cylinder 2.3L engine, I got a new battery about 2 months ago. 2 times recently I've gone to start my car in the morning and it makes a weird clicking sound then kicks on. It has been a little cold when it happens and I've noticed the headlights and dashboard lights sometimes dim and go back to normal when I have them on.

HEARD A POP SOUND FORD FOCUS 2004?

My cousin was driving my car it is an automatic ford focus 2004 the car has no problems what so ever however today when he was driving because he is a beginner he had hes foot on the brake all the time while steerinf and changing gears and he was changing from d to reverse and i heard abig pop sound its driving fine still gears still changinf quick and and no apparent problem however i'm worried as to what it was can anyone help? And is it something for me to worry about i'm scared something bust in the car

Advice car is not accelerating when pressing on gas

Okay i have a 2002 ford focus. I've had it for almost a year now and had numerous problems. Just this past month i've had to get a new alternator (even though i just got a new one months ago), a new water tank and that cleaned out, and had a full engine clean with new spark plugs, these are definitely not the only problems with it. Before i got the full engine clean and spark plugs, my car would die at stop lights and idle terribly. Now its better but its starting to idle again and twice this happened that when i press on the gas to turn at a stop light itll just barly go, which is terrifing and almost got me killed, its like it just wouldnt accelerate. I think its my fuel system now, plus i never go less than a one fourth a tank on gas. I've spent so much money on this car and i need advice. I took my battery to autozone to charge a couple weeks ago and it started leaking a little acid. But i don't think thats the problem, any advice is welcomed.

Veyr scary 2001 ford focus problem?

2001 automatic Ford Focus problem! Randomly when I'm driving at either high or low speeds my car will all of the sudden jolt and lose acceleration as if it shifted into neutral. It only lasts for a second or two and only does this when the "multifunction" light turns on. Sometimes it will stop completely and I will have to restart it at a red light. It will do it for days at a time and then nothing for weeks. It just started doing it again today! What could this be?

What pipe has collapsed on my ford focus 2003?

Engine ideal erratic.stalls. Sounds chuggery etc. Found a slight air leak and sucked pipe just under the throttle housing and it goes into the engine just behind the thermostat housing.obs I have goggled to try and find it but to no avail. I'm drawn to believe that its the crankcase breather hose but there's no mention of this or pictures in my car manual. Also there's pictures of different hoses so i'm unsure of the correct one. Any help would be great cheers