P1342 Audi Code – Ignition Coil Stage 1 Output Short to B+

Possible Causes

NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.

  • Faulty ignition coil
  • Ignition coil harness is open or shorted
  • Poor electrical connection in the ignition coil circuit

Description

Ignition Coil Output Stage 1 Short To B+ is the generic description for Audi code P1342, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no other information about the Audi OBDII P1342 code.

How to Fix

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or service engine soon warning light)

P1342 BMW Code – Cylinder 1 Misfire During Start

Possible Causes

NOTE: The listed causes may not be a complete list of all potential issues and there may be other causes.

  • Faulty spark plug
  • Faulty ignition coil
  • Intake vacuum leak
  • Faulty camshaft position sensor
  • Ignition coil harness is open or shorted
  • Poor electrical connection in ignition coil circuit

Description

Under CARB/OBD regulations, the Engine Control Module (ECM) must determine if a misfire is occurring and also identify the specific cylinder(s) and severity of the misfire event and whether it is an emissions issue or damaging to the catalyst. To accomplish these tasks, the control module monitors the crankshaft for acceleration losses during the firing segments of each cylinder according to the firing order.
The misfire/engine roughness calculation is derived from differences in the period duration (T) of individual gear segments. Each segment period consists of an angular range of 120° crankshaft angle starting 78° before Top Dead Center (TDC).
If the expected period duration exceeds the allowed value, a misfire fault for the affected cylinder is stored in the ECM fault memory. Depending on the measured misfire rate level, the control unit will illuminate the Service Engine Soon light, may cut fuel to the particular cylinder, and may switch lambda operation to open loop. All misfire faults are weighted to determine whether misfires are emissions-related or damaging to the catalyst.

How to Repair

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine Light On (or Service Engine Soon Warning Light)

P1342 Lexus Code – Low Input from Camshaft Position Sensor “A

Possible Causes

NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.

  • Faulty camshaft position sensor
  • Camshaft position sensor harness is open or shorted
  • Poor electrical connection in camshaft position sensor circuit
  • Faulty Engine Control Module (ECM)

Description

The camshaft position sensor is an electronic device used in an engine to record the speed at which the camshaft rotates. This information is used by the Engine Control Module (ECM) to control ignition and fuel injection. The camshaft position sensor detects the retraction of the camshaft (intake) to identify a particular cylinder. The camshaft position sensor detects the piston position. The sensor system consists of a rotating part, typically a disk, as well as a static part, the sensor itself.
When the engine rotates, the high and low parts of the teeth cause a change in the gap with the sensor. The changing gap results in a modification of the magnetic field near the sensor. The change in the magnetic field causes a variation in the sensor voltage.
When the crankshaft position sensor (POS) system becomes inoperative, the camshaft position sensor instead provides various commands for engine components, using the timing of cylinder identification signals.

How to Repair

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or service engine soon warning light)
  • Lack/loss of power
  • Engine stalling

P1342 Mazda Code – PCM Malfunction

Possible Causes

NOTE: The listed causes may not be a complete list of all potential issues and there may be other causes.

  • Faulty Powertrain Control Module (PCM)
  • Powertrain Control Module harness is open or shorted
  • Poor electrical connection in Powertrain Control Module circuit
  • Dead (weak) battery

Description

PCM malfunction is the generic description for Mazda code P1342, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no other information about Mazda OBDII code P1342.

How to Fix

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or service engine soon warning light)

P1342 Mercedes-Benz Code – Camshaft Position Actuator Electrical Fault

Possible Causes

NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.

  • Faulty camshaft position actuator
  • Camshaft position actuator harness is open or shorted
  • Poor electrical connection in camshaft position actuator circuit

Description

The camshaft position actuator electrical fault is the generic description for Mercedes-Benz code P1342, but the manufacturer may have a different description for your specific vehicle model and year. Currently, we have no additional information about OBDII code P1342 Mercedes-Benz.

How to Repair

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or service engine soon warning light)

P1342 MINI Code – Cylinder 1 Misfire During Start

Possible Causes

NOTE: The listed causes may not be a complete list of all potential issues and there may be other causes.

  • Faulty spark plug
  • Faulty ignition coil
  • Intake vacuum leak
  • Faulty camshaft position sensor
  • Ignition coil harness is open or shorted
  • Poor electrical connection in ignition coil circuit

Description

Under CARB/OBD regulations, the Engine Control Module (ECM) must determine if a misfire is occurring and also identify the specific cylinder(s) and severity of the misfire event and whether it is an emissions problem or damaging to the catalyst. To accomplish these tasks, the control module monitors the crankshaft for acceleration losses during the firing segments of each cylinder according to the firing order.
The misfire/engine roughness calculation is derived from differences in the period duration (T) of individual gear segments. Each segment period consists of an angular range of 120° crankshaft angle starting 78° before Top Dead Center (TDC).
If the expected period duration is greater than the allowed value, a misfire fault for the affected cylinder is stored in the ECM fault memory. Depending on the measured misfire rate level, the control unit will illuminate the Service Engine Soon light, may cut fuel to the particular cylinder, and may switch lambda operation to open loop. All misfire faults are weighted to determine whether misfires are emissions-related or damaging the catalyst.

How to Repair

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine Light On (or Service Engine Soon Warning Light)

P1342 Toyota Code – Camshaft Position Sensor “A” Low Input

TOYOTA Code P1342: Causes, Symptoms, and Solutions

Meaning of Code P1342

Code P1342 in a Toyota indicates a problem with the camshaft position sensor or its circuit. This sensor plays a key role in synchronizing ignition and fuel injection by transmitting the camshaft’s position and rotation speed to the ECM (Engine Control Module). If this sensor does not function correctly, the ECM cannot optimize engine performance, leading to misfires, power loss, or stalling.

Common Symptoms

  • Check engine light on (or warning message).
  • Power loss during acceleration.
  • Engine stalling or hard starting.
  • Unstable idle.
  • Increased fuel consumption.

Possible Causes

  1. Faulty camshaft position sensor:
  • Internal deterioration or physical damage (e.g., cracks).
  • Lost magnetization or dirty sensor.
  1. Electrical problems:
  • Damaged wiring harness (cut, short circuit, corrosion).
  • Oxidized, loose, or broken connectors.
  1. ECM failure:
  • Programming error or hardware failure (rare).

Operation of the Camshaft Position Sensor

  • Principle: The sensor uses a toothed wheel attached to the camshaft. When the teeth pass near the sensor, they alter the magnetic field, generating an electrical signal.
  • Role: The ECM uses this signal to determine piston position and synchronize ignition and injection.
  • Backup system: In case of crankshaft sensor failure, the ECM temporarily uses the camshaft sensor, but with reduced performance.

Diagnostic Procedures

  1. Visual Inspection:
  • Locate the sensor (usually near the cylinder head or valve cover).
  • Check the harness and connectors for exposed wires, melted insulation, or corrosion.
  1. Sensor Test:
  • Disconnect the connector and measure resistance with a multimeter (typical value: 800–1500 Ω).
  • Check the signal voltage (approximately 5 V with ignition on).
  1. Circuit Check:
  • Test continuity between the sensor and the ECM.
  • Look for short circuits to ground or interruptions.
  1. ECM Data Analysis:
  • Use an OBD-II scanner to observe real-time sensor data.
  • Compare values with manufacturer specifications.

Recommended Solutions

  1. Replace the Faulty Sensor:
  • Choose an OEM or compatible sensor (e.g., Denso, Aisin).
  • Clean the mounting area before installation.
  1. Repair the Electrical Circuit:
  • Repair damaged wires with waterproof soldering.
  • Replace corroded connectors.
  1. Reset the ECM:
  • Clear the P1342 code after repair.
  • If the code persists, consider reprogramming or replacing the ECM.

Important Precautions

  • Disconnect the battery before any electrical work.
  • Avoid contaminants: Protect the sensor from dirt during handling.
  • Technical reference: Consult a Toyota repair manual to precisely locate the sensor.

Estimated Costs

  • Camshaft position sensor: €50 to €150.
  • Labor: 1 to 2 hours (€80 to €200).
  • ECM replacement (if necessary): €500 to €1,500 (part + programming).

Conclusion

Code P1342 in a Toyota often signals a simple problem like a faulty sensor or poor connection. However, ignoring this code can lead to more serious damage (e.g., misfires damaging the catalytic converter). If basic checks do not resolve the issue, consult a certified Toyota mechanic for a thorough diagnosis, especially if symptoms like frequent stalling persist.

P1342 Volkswagen Code – Ignition Coil Output Stage 1 Short to B+

Possible Causes

NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.

  • Faulty ignition coil
  • Ignition coil harness is open or shorted
  • Poor electrical connection in ignition coil circuit

Description

Ignition Coil Output Stage 1 Short To B+ is the generic description for Volkswagen code P1342, but the manufacturer may have a different description for your specific model and vehicle year. Currently, we have no further information about Volkswagen OBDII code P1342.

How to Repair

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or service engine soon warning light)

Code P1343 – Cylinder 1 Misfire with Fuel Cutoff

Possible Causes

NOTE: The listed causes may not be a complete list of all potential issues and there may be other causes.

  • Faulty spark plug
  • Faulty ignition coil
  • Intake vacuum leak
  • Faulty camshaft position sensor
  • Ignition coil harness is open or shorted
  • Poor electrical connection in ignition coil circuit

Description

Under CARB/OBD regulations, the Engine Control Module (ECM) must determine if a misfire occurs and also identify the specific cylinder(s) and severity of the misfire event, and whether it is an emissions problem or damaging to the catalyst. To accomplish these tasks, the control module monitors the crankshaft for acceleration losses during the firing segments of each cylinder according to the firing order.
The misfire/engine roughness calculation is derived from differences in the period duration (T) of individual gear segments. Each segment period consists of an angular range of 120° crankshaft angle that begins 78° before top dead center (TDC).
If the expected period duration exceeds the allowed value, a misfire fault for the affected cylinder is stored in the ECM fault memory. Depending on the measured misfire rate level, the control unit will illuminate the Service Engine Soon light, may cut fuel to the particular cylinder, and may switch lambda operation to open loop. All misfire faults are weighted to determine whether misfires are emissions-related or damaging to the catalyst.

How to Repair

Check the “Possible Causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or Service Engine Soon warning light)

P1343 Code Audi – Ignition Coil Output, Stage 2, Short to Ground

Possible Causes

NOTE: The listed causes may not be a complete list of all potential problems and there may be other causes.

  • Faulty ignition coil
  • Ignition coil harness is open or shorted
  • Poor electrical connection in ignition coil circuit

Description

Ignition Coil Output Stage 2 Short To Ground is the generic description for Audi code P1343, but the manufacturer may have a different description for your specific vehicle model and year. Currently, we have no further information about Audi OBDII code P1343.

How to Repair

Check the “Possible Causes” listed above. Visually inspect the wiring harness and related connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or service engine soon warning light)