So, I am having major issues with my 2001 VW beetle. Over the past 3 years, I have replaced the mass air sensor, coolent temp. sensor, knock sensor (twice within 3 years), timing belt, belt tensioner, roller, and 4 coils. I'm sure there are more parts, I just can't remember them. My car is acting up once again-- by the way, the second knock sensor and the 4 coils were replaced this past week. My mechanic is blaming on a "bad coincidence" that I picked up my car from his shop last night, drove it twice and then it wouldn`t start. It won`t even turn over, but the lights and radio are working fine, so it is not the battery. The mechanic is saying it is my starter that has gone out now. I have about 134,000 miles on it. I don`t know what to do. Should I believe him? Is it really just a coincidence that this all happens with a new mechanic and all within 2 weeks? How much does a starter cost? I have already paid him over $700 for the coils and knock sensor.'.

No, it does not have a IAC, Confirmed with the Dealer. This is for the 2.0 GAS but it does have a Secondary Air Pump and a Secondary Air Pump Control Valve.

The Major problem with the 2001 Jetta GAS is the Mass Airflow Sensor.......

The TDI is a Turbo Diesel and is not a 2.0

check engine light flashing means misfire and it staying on is probably because of your o2 sensor picking up all the unburnt fuel. check all the spark plugs again and make sure you didn't cross any wires. i'm pretty sure the wires were crossed or the spark plugs were fouled

Do you have a K&N air filter?

How many miles are on it?

Ever replace the MAF before?

Was check engine light on?

On some VW's there is a snowscreen in the air intake. If you take out the airbox, the snowscreen would be in the tube going to the fender. My 02 had it, some later models don't. Mine was jam packed after 30,000 miles. I found it by accident...

outdoor temp sensor probably loose connection/failed. The outside air temp sensor is on the bottom drivers side of the grill. Find it and probe it w/ a multimeter. 0.0, or infinite resistance means the sensor is shot.

Also make sure you are getting power from the harness

Bank 1 and 2 detecting too lean a condition. Yuck. Per the 1998 official Toyota shop manual for a Sienna, it could be a bad 1) coolant temp sensor 2) bad HO2S (or Fuel/Air sensors) 3) bad mass airflow sensor 4) restricted fuel somewhere (like the fuel filter in the tank! ouch.) First, check to function of the coolant temp sensor. You can pull it and play wiht your stove and boiling water or just buy a Carchip data collector and download the data to your computer to analyze. Second, before you replace that horribly expensive Mass Airflow Sensor, pull it out and *carefully* spray it clean with brake cleaner or an electronic cleaner of some sort. And do NOT touch any of the itty-***** wires inside with anything or you WILL be replacing it. Third, if you have HO2S sensors, you can check the resistance of them using an multimeter to see if they are within spec. I forget exactly but it's something low like 9-12 ohms at 68F. If you have Fuel/Air sensors instead, it's dealer diagnostic time. Fourth, if you suspect fuel pressure or fuel flow issues, I recommend dealer diagnostic time too. My best friend got severely burned (2nd and 3rd degree on 50% of his body) messing with fuel and his VW bug when we were in high school. 25 years later, he is still covered in scar tissue and will be forever.
I hope this helps you

On this model the IAT intake air temp sensor is inside the mass air flow sensor. Also called air flow meter.

If it was the mass air flow sensor, you will have a check engine light. The small rubber hoses connected to/from the mass air flow connector might have come loose or have a crack, which will cause compression to be too low. Check there before replacing the maf sensor.

crank sensor could be bad or the mass air meter could be bad

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check your mass air flow sensor , it take over fuel pump control after the engine starts