Question about 2002 Volkswagen Beetle Turbo S
According to haynes beetle repair the code is turbocharger boost pressure control valve positive deviation. to trouble shoot
check the wiring, connecting pipes.using a hand held vacuum pump apply vacuum to the wastegate actuator,(with engine not running) check the actuator arm and lever for freedom of movement , disconnect the electrical connector from the boost pressure control valve. using an ohmmeter check the solenoid windings for an open circuit, the boost pressure control valve should measure about 25 to 35 ohms if excessive resistance or open circuit is indicated replace control valve.
a scan tool is required for a complete diagnosis of the system control circuits some may be rented from a local auto repair store hope this helps and norrows it down for ya
Posted on Jun 21, 2008
My 2002 beetle tdi check engine light on and the reason was the glow plug or harness was bad. I replaced the glow plugs and the harness and the light still comes on. what next could be wrong.
Posted on Jul 04, 2011
Hi Y me!
According to ALLDATA.com there are 10 possible causes for P1556.
1. Cold Start injector N108
2. EGR vacuum regulator solenoid valve N18
3. Air conditioning compressor interrupt
4. Fuel cut off valve N109
5. Wastegate bypass regulator valve N75 for boost
6. Glow plug relay J52
7. Glow plug indicator lamp K29
8. Relay J359 preheat coolant, low heat output(man
9. Relay J360 preheat coolant, high heat output(man
10 Malfunction indicator lamp(MIL)
K82 Exhaust warning lamp, however K83 is actually
being tested by VAG 1551
If this code is accompanied by a loss of power, I would suggest removing and cleaning the EGR valve and the EGR port in the intake manifold... It has probably become clogged up with Diesel soot accumulation, which restrict the engine's airflow capability (strangles the engine!)
If you do this yourself, you'll need some good stiff bendable wirebrushes and a good solvent that acts on the carbon accumulation.
Hope this helps and good luck! Let us know if you have other questions...
Posted on Jun 16, 2008
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