Lexus DTC P1315 – Igniter Circuit Malfunction (No. 4)
DTC P1315 meaning on Lexus
DTC P1315 for Lexus refers to an Igniter Circuit Malfunction (No. 4). This diagnostic trouble code indicates an issue with the ignition system’s circuit related to the No. 4 cylinder.
Lexus DTC P1315 symptoms
Symptoms of DTC P1315 on a Lexus may include:
- Engine misfires
- Reduced engine performance
- Difficulty starting the engine
- Illuminated check engine light
Lexus DTC P1315 causes
Common causes of DTC P1315 on a Lexus include:
- Faulty ignition coil
- Wiring issues in the ignition circuit
- Defective spark plug
- ECU (Engine Control Unit) malfunction
Lexus DTC P1315 seriousness
Ignoring DTC P1315 on a Lexus can lead to potential engine performance issues, increased fuel consumption, and further damage to engine components. It is recommended to address this code promptly to prevent more severe problems.
How to diagnose DTC P1315 on Lexus
To diagnose DTC P1315 on a Lexus, follow these steps:
- Use an OBD-II scanner to retrieve the trouble codes.
- Inspect the ignition coil, wiring, and spark plug related to cylinder No. 4.
- Check for any visible damage or loose connections in the ignition circuit.
- Test the ECU for proper functionality.
How to fix DTC P1315 on Lexus
To fix DTC P1315 on a Lexus, consider the following:
- Replace the faulty ignition coil if necessary.
- Repair any damaged wiring in the ignition circuit.
- Replace the spark plug for cylinder No. 4.
- If the ECU is faulty, have it repaired or replaced by a professional.
How to erase DTC P1315 on Lexus
To erase DTC P1315 on a Lexus:
- Use an OBD-II scanner to clear the trouble codes.
- Ensure that the underlying issue causing the code has been resolved.
- Perform a test drive to confirm that the code does not reappear.
Recommended tools for Lexus diagnostics
Explore our expert picks: The Best OBD2 Scanners for 2025
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.