Fault code P2029 and/or P201C stored in engine control unit, the engine may shake or may not properly respond to opening throttle - AF09.00-P-8100A

ENGINE 271 in MODEL 203, 209, 211, 171 

OPERATION NO. OF OPERATION TEXTS OR STANDARD TEXTS AND FLAT RATES

Category	Op. no.	Operation text	Time	Acc. no.	Code
P	023996	Perform a leak test using compressed air in the intake tract of the air cleaner housing	007 WU	-	-

Damage code	Cause	Remedy
	Leaks in the area of the intake system.	For precise diagnosis there is a special tool available which can be used to easily locate leaks in the intake tract. Special tool for leak tests:
		Charge air test pressure gauge from test kit Stop plug from test kit	Fig 1
		Connection piece (sealing cap with locking rod)	Fig 2
		1 Remove the air cleaner filter from the air cleaner box and set the sealing cap on the mass air flow sensor.
		2 Support the sealing cap in the air cleaner box using the locking rod.
		3 Close oil dipstick with stop plug.
		4 Connect pressure gauge to sealing cap and check intake system for leaks using compressed air. Leaks can now be located acoustically or can be made visible by spraying leak detector spray.

Fig 1: Identifying Leak Tester (611 589 02 21 00)

Fig 2: Identifying Connecting Piece (271 589 00 91 00)