Volkswagen Golf / Golf GTI / Jetta. Manual — part 172

01-230

Evaluating display group 36, display zone 2 - Diagnosis of Oxygen Sensor (O2S)
after Three Way Catalytic Converter (TWC)

Appears on display

Possible cause

Corrective action

Oxygen Sensor (O2S)
after Three Way
Catalytic Converter
(TWC) not OK.: "B1 P2
n.OK.

DTC stored in DTC

memory

- Check DTC memory

Page

01-23

, DTC memory, checking

and erasing

Oxygen Sensor

(O2S) after Three
Way Catalytic
Converter (TWC)
faulty

- Perform a road test to remove
possible contaminates on
Oxygen Sensor (O2S) and repeat
check.

- Perform diagnosis again if result
is same:

- Check Oxygen Sensor (O2S)
and Oxygen Sensor (O2S)
control after Three Way Catalytic
Converter (TWC)

Page 24-140

Measured value (data) blocks

01-231

Display group 41 - Oxygen Sensor (O2S) control - Oxygen Sensor (O2S) heating

Engine running at idle

Read measured
value block 41

Indicated on display

---

Text

xx.xx

k

Text

1

2

3

4

Display zones

Specification Evaluation

Oxygen Sensor (O2S)
heating after Three Way
Catalytic Converter (TWC)

(Htg.nC.OFF / Htg.nC.ON)

Htg.nC.ON

Htg.nC.OFF

sporadically

changing

---

Resistance of Oxygen Sensor
(O2S) heating after Three Way
Catalytic Converter (TWC)

0.00...25.00 k

---

Oxygen Sensor (O2S) heating before Three
Way Catalytic Converter (TWC)

(Htg.bC.OFF / Htg.bC.ON)

Htg.bC.ON

Htg.bC.OFF

sporadically

changing

---

No display

---

---

Note:

The Oxygen Sensor (O2S) heating may be switched on or off depending on the
operating conditions of the engine, therefore the display in display zones 2 or 4 may
show "Htg.b(a)C.ON" or alternating from "Htg.b(a)C.ON" to Htg.b(a)C.OFF".

Measured value (data) blocks

01-232

Display group 43 - Oxygen Sensor (O2S) control - Oxygen Sensor (O2S) aging
diagnosis of Oxygen Sensor (O2S) after Three Way Catalytic Converter (TWC)

Control module in function "04-Basic setting"

Vehicle stationary, engine running at increased idle speed (only with depressed

brake pedal and accelerator)

System in basic
setting 43

Indicated on display

xxxx
rpm

xxx.x

C

x.xxx

V

Text

1

2

3

4

Display zones

Specification Evaluation

Result of Oxygen Sensor
(O2S) after Three Way
Catalytic Converter (TWC)
aging test

(Test OFF / Test ON / B1
P2 OK. / B1 P2 n.OK.)

B1 P2 OK.

Page 01-

233

Oxygen Sensor (O2S) voltage

Oxygen Sensor (O2S) after
Three Way Catalytic Converter
(TWC)

0.100...0.900

V

Page 01-

229

Three Way Catalytic Converter (TWC)
temperature

min. 380.0 C

---

Engine speed

Approx. 2300

rpm

---

Note on display zone 2:

Value calculated from engine speed and engine load.

Measured value (data) blocks

01-233

Evaluation of display group 43, display zone 4 - Oxygen Sensor (O2S) diagnosis -
Oxygen Sensor (O2S) aging after Three Way Catalytic Converter (TWC)

Appears on display

Possible cause

Corrective action

Oxygen Sensor (O2S)
after Three Way
Catalytic Converter
(TWC) not OK.: "B1 P2
n.OK.

DTC stored in DTC

memory

- Check DTC memory

Page

01-23

, DTC memory, checking

and erasing

Oxygen Sensor

(O2S) after Three
Way Catalytic
Converter (TWC)
faulty

- Perform a road test to remove
possible contaminates on
Oxygen Sensor (O2S) and repeat
check.

- Perform diagnosis again if result
is same:

- Check Oxygen Sensor (O2S)
and Oxygen Sensor (O2S)
control after Three Way Catalytic
Converter (TWC)

Page 24-140

Measured value (data) blocks