Volkswagen New Beetle. Manual - part 1633

If the specifications are obtained: 

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Press --> button.  

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Remove engine speed adjuster VAG 1788/10 from accelerator pedal.  

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Press buttons -0- and -6- for function "End output" and confirm entry with -Q- button.  

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Switch off ignition. 

Continuation 

If the specifications are not obtained: 

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Remove engine speed adjuster VAG 1788/10 from accelerator pedal.  

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Road test vehicle to free oxygen sensor of possible contaminates and repeat test. 

Observe the valid safety precautions when carrying out a road test, see SAFETY PRECAUTIONS . 

If the specifications are again not obtained: 

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Replace oxygen sensor before Three Way Catalytic Converter (TWC) -G39-, see item 10 .  

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Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory, see DTC 
MEMORY OF MOTRONIC ENGINE CONTROL MODULE (ECM) -J220-, CHECKING AND 
ERASING .  

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Read readiness code, see READINESS CODE, DISPLAYING . If DTC memory has been erased or 
Motronic Engine Control Module (ECM) -J220- was disconnected from battery positive, readiness code 
must be generated again, see READINESS CODE, GENERATING .  

Oxygen sensor aging, oxygen sensor after Three Way Catalytic Converter (TWC), checking 

Special tools, test equipment and auxiliary items 

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VAG 1551 scan tool (or VAG 1552 mobile scan tool) with VAG 1551/3B cable  

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VAG 1788/10 RPM adjuster 

CATALYTIC CONVERTER (TWC), 

CHECKING , continuation

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Multiport Fuel Injection (MFI) , 1.8L AWP, AWV - New Beetle

  

Fig. 123: Identifying Special Tool 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

Test conditions 

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Engine Coolant Temperature (ECT) must be at least 80 °C, see display group 04, display zone 3  

Functional check 

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Connect VAG 1551 scan tool ((VAG 1552). Start engine and select "Address word" 01 of Motronic 
Engine Control Module (ECM) -J220-. Engine must be running at idle speed. Connecting scan tool and 
selecting Motronic Engine Control Module (ECM) -J220-, see VAG 1551, CONNECTING AND 
SELECTING MOTRONIC ENGINE CONTROL MODULE (ECM) -J220- . 

Indicated on display 

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Multiport Fuel Injection (MFI) , 1.8L AWP, AWV - New Beetle

  

Fig. 124: Identifying Scan Tool Display - Checking Aging, HO2S After TWC (1 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Press buttons -0- and -4- for function "Basic Setting" and confirm entry with -Q- button. 

Indicated on display 

Fig. 125: Identifying Scan Tool Display - Checking Aging, HO2S After TWC (2 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Press buttons -0-, -4- and -3- for "Display group number 43" and confirm entry with -Q- button. 

Indicated on display (1 to 4 - Display zones)

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Multiport Fuel Injection (MFI) , 1.8L AWP, AWV - New Beetle

  

Fig. 126: Identifying Scan Tool Display - Checking Aging, HO2S After TWC (3 Of 3) 
Courtesy of VOLKSWAGEN OF AMERICA, INC. 

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Adjust RPMs with VAG 1788/10 RPM adjuster to 1800 to 2200 RPM.  

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Check specifications in display zones 1 to 4.  

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Maintain engine speed at 1800...2200 rpm until display in display zone 4 jumps from "Test OFF" to "Test 
ON". Three Way Catalytic Converter (TWC) temperature in display zone 2 must be at least 300 °C  

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Continue to maintain speed at 1800...2200 rpm until specification "B1-S2 OK" appears in display zone 4. 

DISPLAY GROUP 43: OXYGEN SENSOR DIAGNOSTIC AFTER THREE WAY CATALYTIC 
CONVERTER (TWC) (AGING CHECK) 

If the specifications are obtained: 

 

Display zones

1

2

3

4

Display group 43: oxygen sensor diagnostic after Three Way Catalytic Converter (TWC) (aging 
check)
Display

xxxx RPM

xxx.x °C

x.xxx V

Test OFF/Test ON

B1-S2 OK/B1-S2 n.OK

Indicated

Engine speed 

(in steps of 

40)

Three Way Catalytic 

Converter (TWC) 

temperature

Diagnostic condition and diagnostic result

Working 
range

0 to 6800 

RPM

-

-

-

Specifications 1800 to 2200 

RPM

>300 °C

0.100 to 0.900

B1-S2 OK.

-

-

If the specifications are not 

obtained, see Functional check , 

Continuation

 

2003 Volkswagen New Beetle GLS 

1998-2004 ENGINE PERFORMANCE Multiport Fuel Injection (MFI) , 1.8L AWP, AWV - New Beetle