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I GOT A CODE OF P0401

It has been a month since i got this car and I can honestly say it has given more headaches in the last month than i have ever had to endure in my life.
Brief history: I bought the car from a private seller who managed to "mask" away any problems this car had i a test drove it on 2 occasions. I have had to have a transmission flush, changed a leaking oil cooler, change tires, so far i have spent close to $1000 on the car. I decided to take it to Hyundai dealership to get services as i felt that was going to be safest option.
Now to the problems, from almost day 1 the car has tapping sound that emanates from near the timing belt section, i have looked but cannot figure out what it is, could it be the tappets? I have had an oil change. The tapping noise does not go away as i accelerate.
I took the car to a car wash a week ago and after a few hours i noticed my turn signals were not working, i checked the fuses and replaced a blown fuse (10amp). I have checked if there is any moisture in the lights but there is none. I have had to change blown fuses 4 times this week, until i decided to use a 15am fuse, i understand that this is not recommended but i am tired of having to change fuses. I sometimes get an electric shock when i get out of the car!
I usually don’t drive on the highway as i work close to home, but when i get on the highway the car sputters when going from40mph to 60mph. On 2 occasions the check engine light has gone on an the car will continue to struggle to pick up speed around 55miles per hour, if i drive for 5 miles the check engine light goes off and all seems fine, I have never been close enough to a service center to check what codes come up as the check engine light goes off before i can do that.
I am at my wits end with this car and any suggestions of car mechanics in the apex North Carolina area that can be recommended will be appreciated greatly. I cannot afford to put any more money into this car.
Apologies for the long question- i look forward to hearing from the experts.

I've had this problem for several weeks now. Car feels like it has a constant miss throughout the rev range. I have just done a plenum pull, installed new injectors, replaced injector and coil connectors, new temp sensor and cleaned the throttle bodies as I had planned to do this - no difference. I ran ECU diagnostics with code 55 recorded with engine off - everything OK. With engine on recorded left side O2 sensor is faulty.
I also checked the voltage on the MAF and got a reading of 0.48 volts with key on (spec 0.8V). With the engine running the reading was within spec at 1.29 volts. I cleaned the MAF with MAF Cleaner and also cleaned connectors and terminals. Re-tested - no difference in values.
Voltage on Throttle Position Senser OK at both connectors - spec in the manual states approximate values for a couple of wires - only discrepancy I got was 0.86V wher it states approx 1V.
Also timing belt etc was replaced and has done approx 50,000Km (half way throuigh its life cycle).
I am planning to change the O2 sensor this weekend, easier said than done.
Any help with this issue would be appreciated as I am becoming frustrated - do the figures recorded mean I need to replace anything.

i have sedement in the fuel tank to be removed (foreign matter in fuel I purchased at a service station).

i would like to know where the computer is on the 1991

this happens when truck is off or on.

I have cloth seats I have noticed I get a shock when exiting the Van, any ideals what is causing this.. anyone else having this issue, also brake pedal goes to floor sitting at idle, even after replacing master and new breaks, ford says they don't know what the problem is..

also thinking of just switching air ride over ,with shock kit..any advice on if the car will ride ok and which company is best for replacement kit

had air ride work done..now with ajar light on ,,cant adjust air ride with computer.. circuit seams to be on same.. ajar light and air module

My 2003 Ford Ranger starts well, idles well and sometimes drives well. But quite a bit of the time any more it acts like it has no power. it misses out. I replaced the fuel filter, had the exhaust checked to make sure the catalytic converter is ok and had it hooked up to a diagnostics machine but have had no luck diagnosing it. The mechanic has it right now and is replacing emissions items but is stumped as to why it is acting the way it is.

What is the estimated cost to replace the speedometer (parts and labor) in a 2004 Iszuz Ascender

Speedometer sometimes works and sometimes doesn't. It will some time stick on one number like 80 and then go back down to zero and stay there.

SERVICE AIR BAG MESSAGE APPEARED THIS MORNING FOR NO APPARANT REASON, NO CRASH OR ANYTHING, JUST STARTED ENGINE AND IT WAS ON. IS THIS DANGEROUS? WHAT SHOUL I DO?

Car jerks and chugs when accelerating. Starts and idles fine, what is this?

Service Air Bag message appeared this morning for no apparent reason, no crash or anything. What can I do?