Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSVOLKSWAGEN2012JETTA TDI, 4D SEDAN, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 106 (2.0L - IGNITION/GLOW PLUG SYSTEM - ENGINE CODE(S): CBFA & CCTA (SEDAN))28 IGNITION/GLOW PLUG SYSTEMDESCRIPTION AND OPERATIONIGNITION SYSTEM COMPONENT OVERVIEW

2012 Volkswagen Jetta TDI, 4D Sedan, Standard Trans

Ignition System Component Overview

2012 Volkswagen Jetta TDI, 4D Sedan, Standard TransSECTION Ignition System Component Overview

WARNING: This page is about a different variant/trim than selected.

Fig 1: Identifying Assembly Overview: Ignition System Component

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Knock Sensor 1 -G61-
- On the front of the cylinder head under the intake manifold.
- Contacts are gold plated.
- For electrical connectors, refer to Fig 4.
- Removing and installing, refer to Knock Sensor 1 -G61- .
Bolt
- 22 Nm
- Tightening specification influences the function of the knock sensor.
Ignition Coil with Power Output Stage
- Ignition coil 1 with power output stage -N70-.
- Ignition coil 2 with power output stage -N127-.
- Ignition coil 3 with power output stage -N291-.
- Ignition coil 4 with power output stage -N292-.
- Removing and installing, refer to IGNITION COIL WITH POWER OUTPUT STAGE .
Spark Plug --
- 25 Nm
- If the spark plug is replaced, lubricate the ignition coil with power output stage. Refer to Install Ignition Coils with Power Output Stages .
- Note the change intervals. Refer to MY 2011 MAINTENANCE INTERVALS .
- Type and electrode gap, refer to SPARK PLUG TECHNICAL DATA .
- Remove and install using the spark plug removal tool 3122 B.
O-ring
- No replacement part available.
- Replace if damaged.
Engine Speed Sensor -G28-
- On the front lower left side of the cylinder block, next to the oil separator. Refer to Fig 3.
- Removing and installing, refer to Engine Speed Sensor -G28- .
Bolt
- 9 Nm
Camshaft Position Sensor -G40-
- Bolted on the front of the cylinder head cover. Refer to Fig 2.
- For electrical connectors, refer to Fig 4.

Fig 2: Camshaft Position Sensor G40 Electrical Connector

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

CMP sensor

Fig 3: Engine Speed (RPM) Sensor G28

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Engine speed sensor

Fig 4: Camshaft Position Sensor G40/Intake Manifold Runner Position Sensor G336, Knock Sensor (KS) 1 G61 & Fuel Injectors 8-Pin Harness Connector Electrical Harness Connectors

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

CMP sensor
Knock sensor 1
8 pin harness connector for fuel injectors

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.