PO301 code on Hyundai Sonata. Replaced wires, plugs, coil packs, and mass air flow sensor.

code p 0101 refers to mass air flow (MAF) sensor /volume air flow(VAF) sensor --range /performance problem===causes ---intake leak/blockage ---MAF/VAF sensor
code p 0201 refers to injector 1--circuit malfunction===causes wiring---injector---ECM
code p 0224 refers to throttle position(TP) sensor B/ accelerator pedal position (APP) sensor B--circuit malfunction===causes --wiring ---poor connections --TP/APP sensor ---ECM

Check mass air flow sensor (if equipped). clean mass air flow sensor( only with mass air flow sensor cleaner. PLZ). I think once you've cleaned the sensor, you'll get your acceleration back. Hope this post was of some help.

P0103 HYUNDAI - Mass or Volume Air Flow Circuit High InputPossible causes- Dirty mass air flow sensor
- Dirty mass air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor electrical circuit poor connection
- Intake air leaks
- Faulty mass air flow sensor
Tech notesBefore replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.
P0112 HYUNDAI - Intake Air Temperature Sensor 1 Circuit Low InputPossible causes- Dirty air filter
- Intake air temperature (IAT) sensor harness is open or shorted
- Intake air temperature (IAT) sensor electrical circuit poor connection
- Faulty intake air temperature sensor
When is the code detected?An excessively low voltage from the sensor is sent to ECM.

Common Problems That Trigger the P0152 Code

• Defective Oxygen Sensor
• Faulty Oxygen Sensor wiring or connections
• Shorted Oxygen Sensor Heater element(s)

Common Misdiagnoses

• Oxygen Sensor is replaced when the problem is faulty Oxygen Sensor wiring or connections
• Oxygen Sensor is replaced when the problem is an over-reporting Mass Air Flow Sensor, clean mass air flow sensor first, to see if thats the problem. good-day ! just type this in search on pc. 02 sensor symtoms, and it will give you the details of a bad sensor.

P0301 - Cylinder 1 Misfire Detected.

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.

They sell a spray cleaner at parts stores its in a spray can with a tube How effitive it is im not sure i mean i have never seen it fix one that wasn;t working but could give it a try How ever Po171 is not the code for the mass air flow sensor its fuel trim lean bank 1 O2 sensor is reading MAF would be PO101-PO103 any of those three codes

Could be your mass air flow sensor.

it could be maf sensor or a blocked catalytic convertor fuel pump

Higher octane gas 93 with some good octane boost in the black can at autozone cost about 7 dollars or a bottle of 104 octane boost. Change the fuel filter. Probably only one coil pack is bad. The OBDII reader should tell you which one was a misfire.

Sometimes the mass air flow sensor will become clogged with some miniscule particles of dust or whatever else. When you open up your hood somewhere near where the air filter box is, there will be a hose running from that to the engine, the mass air flow sensor should be somewhere in near there. They are easy to remove and should be held in place with a few screws. Make sure not to touch any of the electrical connectors on the inside or allow them to get dirty. I used mass air flow sensor cleaner from the local parts place but it is a bit pricey. There may be some alternative cleaners available that are not as expensive. Take the sensor to a relatively dust free area and spray it all over with the cleaner and allow to dry. At the same time under the hood where the sensor was spray that area as well. Once the sensor has dried out re-install it and you should notice an improvement. If the problem still persists you may need to change your spark plugs, or spark plug wires.