Question about 2001 Volkswagen Beetle
Engine light is on and EPC light comes on at acceleration and significantly reduced power. Here are the codes from Auto Zone. P0321 faulty CKP sensor P0341 faulty CMP sensor (intake) camshaft position sensor P0121 faulty throttle valve control module (TPP) P0420 air leak near or faulty fuel control H02S (heated oxygen sensor)
Sounds like all those sensors are going to need replaced. Basically, they are all in charge of metering the air and fuel to the engine, so if they are malfunctioning, the car isn't going to run correctly.
Posted on Apr 16, 2014
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Posted on Jan 02, 2017
First, to read VW codes you will want to get yourself a $50 VAG tool. It will read all your systems, not just the ECU.
Electronic Power Control can go out for several reasons. Check your brake lights with the car running. Check you radiator fluid level. If the car is running bad, you could have bad spark plugs/ wires or ignition coil.
The traction control is tied into the ABS system and often causes problems here as well. Each wheel has a speed sensor and magnet wheel in the hub. You can check these for damage by removing the tires for access. The sensors come out by hand, and inside the hole they come out of is the place to check the magnets with a flash light. Apply a small amount of wheel bearing grease to the sensor.
The control unit goes out in these systems at an alarming rate. They can be easily removed, and repaired for under $200 at modulemaster.com
Since it is intermit, I suspect most likely a loose sensor, or electrical connector.
If your brakes feel squishy at all, bleed the brake lines of air and contaminants.
Posted on Feb 23, 2010
SOURCE: 1999 volkswagen stalled
first check cylinder 1 , spark plug, ht leads, coil,
then clean the trottle body with carb cleaner
if that does not work replace the throttle body, comes complete, and do a basic setting on it with diagnostic machine
Posted on Feb 19, 2009
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