2.0L Aba - Mil On - O2 Sensor DTC Stored In Memory (GROUP 01, NO. 96-05)

WARNING: This page is about the Passat TDI, 4D Sedan, Automatic, which is a different variant/trim than selected.

Publication date: 1996-02-14
Reference number: GROUP 01, NO. 96-05

2.0L ABA - MIL ON - O2 SENSOR DTC STORED IN MEMORY

TECHNICAL SERVICE BULLETIN

Reference Number(s): GROUP 01, NO. 96-05, Date of Issue: November 21, 1996

MALFUNCTION INDICATOR LIGHT (MIL) ON, O2 SENSOR DTC'S STORED IN DTC MEMORY

Model(s): All Volkswagen Models With 2.0L (Engine Code ABA) With OBD II

Group: 01 - On-Board Diagnostic

Bulletin No.: 96-05

Date: November 21, 1996

CONDITION

MIL ON with one of the following DTC combinations stored in DTC memory may lead to incorrect repair.

1. SINGLE DTC

Diagnostic Code DTC SAE	VAG	Malfunction Text
P0133	16517	O2 Sensor Circuit Slow Response (Bank 1, Sensor 1)

2. COMBINATION DTC

Diagnostic Code DTC SAE	VAG	Malfunction Text
P0133	16517	O2 Sensor Circuit Slow Response (Bank 1, Sensor 1)
P0140	16524	O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 2)

3. COMBINATION DTC

Diagnostic Code DTC SAE	VAG	Malfunction Text
P0134	16518	O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)
P0135	16519	O2 Sensor Circuit Heater Circuit Malfunction (Bank 1, Sensor 1)

SERVICE

To assist the Technician in Troubleshooting customer complaints relating to the Oxygen (O2) Sensors, the following diagnostic test procedure was developed.

NOTE: DO NOT erase the DTC memory before diagnosis (important values could be erased).

Follow the Repair procedure associated with the existing condition:

CONDITION 1 - SINGLE DTC

SINGLE DTC

Diagnostic Code DTC SAE	VAG	Malfunction Text
P0133	16517	O2 Sensor Circuit Slow Response (Bank 1, Sensor 1)

Go to Repair Manual 2 0 Liter OBD II VAG 1551 Fuel Injection & Ignition (W42 011 294 121A) page 24-58 and perform workshop diagnosis for Display Group 130.

If results are OK, do not replace Bank 1 Sensor 1 (Pre-Sensor). Condition may be due to Bank 1 Sensor 2 (Post-Sensor). Perform the following:

Go to Repair Manual 2 0 Liter OBD II VAG 1551 Fuel Injection & Ignition (W42 011 294 121A) page 24-60 and check Display Group 131 (Channel 3) for high delay time.

Normal is +/- 700ms

Check Display Group 131 (Channel 4).

If bit 7=1 and Group 130 diagnosis is OK then condition is most likely due to the rear Sensor.

If results are as listed above:

Go to Repair Manual 2.0 Liter OBD II VAG 1551 Fuel Injection & Ignition (W42 011 294 121A), page 24-48 and check basic voltage at ECM connector.

If basic voltage checks OK then:

Reconnect Bank 1 Sensor 2 (Post-Sensor).

Go to Repair Manual 2.0 Liter OBD II VAG 1551 Fuel Injection & Ignition (W42 011 294 121A), page 24-44 and check Display Group 116 (Channel 3).

At 2500 rpm with Catalytic Converter temperature at 360°C minimum the voltage should be fairly stable (between 500mV and 650mV).

Wiggle wires at Bank 1 Sensor 2 (Post-Sensor) -B-. See Fig 1 .

If voltage changes erratically, then wiring is most likely the cause. For example: approx. 450mV (steady or constant) indicates an inactive Post-Sensor (Sensor should be replaced).

WARRANTY INFORMATION - CONDITION 1

When procedure applies to vehicles within warranty use the following:

PART IDENTIFIER: 2469

LABOR OPERATION: 2469710 80 TU

CONDITION 2 - COMBINATION DTC

COMBINATION DTC

Diagnostic Code DTC SAE	VAG	Malfunction Text
P0133	16517	O2 Sensor Circuit Slow Response (Bank 1, Sensor 1)
P0140	16524	O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 2)

Use the same procedure as condition 1.

NOTE: A faulty Post-Sensor may trigger DTC code P0133 (16517)

WARRANTY INFORMATION - CONDITION 2

When procedure applies to vehicles within warranty use the following:

PART IDENTIFIER: 2469

LABOR OPERATION: 2469710 80 TU

CONDITION 3 - COMBINATION DTC

COMBINATION DTC

Diagnostic Code DTC SAE	VAG	Malfunction Text
P0134	16518	O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)
P0135	16519	O2 Sensor Circuit Heater Circuit Malfunction (Bank 1, Sensor 1)

Go to Repair Manual 2.0 Liter OBD II VAG 1551 Fuel Injection & Ignition (W42 011 294 121A) page 24-37 and perform workshop diagnosis Group 120.

If results of diagnosis are OK:

Go to Repair Manual 2.0 Liter OBD II VAG 1551 Fuel Injection & Ignition (W42 011 294 121A) page 21-40.

Using a multimeter measure resistance between pins 1 and 2 of disconnected Bank 1 Sensor 1 (Pre-Sensor -A-). See Fig 1 .

Wiggle wires at Pre-Sensor -A- while watching the resistance.

If resistance is greater than 24 Ohms or is erratic, the Pre-Sensor -A- heater is malfunctioning (Pre-Sensor should be replaced).

WARRANTY INFORMATION - CONDITION 3

When procedure applies to vehicles within warranty use the following:

PART IDENTIFIER: 2469

LABOR OPERATION: 2469711 15 TU

Fig 1: Pre-Sensor -A- & Post-Sensor -B- Locations