Road test procedure

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 1999 Volkswagen Jetta, 1999 Volkswagen Golf, 1999 Volkswagen Cabrio, 1998 Volkswagen Jetta, and 1998 Volkswagen Golf. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Avoid deceleration fuel cut-off during this diagnostic test. It causes the three way catalytic converter to store oxygen, diagnostic test will then be blocked for at least 10 seconds.

Transmission Range 2 or 2nd gear must be selected
Engine speed must be kept between 2500 and 3500 RPM
Continue test drive until specifications are attained

Check specifications during test drive (second technician necessary). See airbag warning. See TEST SEQUENCE .

Continue test drive until all specifications are obtained.

DISPLAY GROUP: 125 FUNCTION: 04

	Display fields
	1	2	3	4
Display group: 125 Function: 04
Display	xxxx rpm	x.x %	x.x %	xxxx xxxx
Indicated	Engine speed	O2S adaptation at partial throttle	O2S adaptation at idle	Diagnostic conditions
Specification	2500 to 3500 rpm Depending upon driving condition	-10 to 10 %	-12.4 to 12.4 %	01x1 xxxx x = Not relevant
Working range	800 to 6000 rpm	-23 to 23 %	-12.4 to 12.4 %

RELEVANCE OF 8 DIGIT NUMBER BLOCK IN DISPLAY FIELD 4

Relevance of 8 digit number block in display field 4
1	2	3	4	5	6	7	8	Specifications of diagnostic conditions
0								Reduced correction range active
	1							Partial throttle adaptation active
			1					O2S control before three way catalytic converter active