P0202 – OBD-II DTC

OBD-II DTC P0202 – Injector Circuit Malfunction – Cylinder 1

DTC P0202 meaning

DTC P0202 refers to a malfunction in the injector circuit for cylinder 1. This code indicates that the Engine Control Module (ECM) has detected an issue with the electrical circuit that controls the fuel injector for the first cylinder. The injector may not be receiving the correct voltage or may be malfunctioning, leading to improper fuel delivery.

DTC P0202 symptoms

Common symptoms associated with DTC P0202 may include:

• Engine misfire
• Rough idling
• Decreased engine performance
• Increased fuel consumption
• Check Engine Light illuminated

DTC P0202 causes

Several factors can lead to the occurrence of DTC P0202, including:

• Faulty fuel injector
• Open or short circuit in the injector wiring
• Defective ECM
• Corroded or damaged connectors
• Faulty fuel injector driver circuit

DTC P0202 seriousness

DTC P0202 can be serious as it may lead to engine performance issues. If left unaddressed, it can cause further damage to the engine or other components. It is important to diagnose and repair the issue promptly to maintain optimal vehicle performance and prevent additional complications.

How to diagnose DTC P0202

To diagnose DTC P0202, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the DTC.
2. Inspect the wiring and connectors for cylinder 1 injector for any visible damage or corrosion.
3. Check the resistance of the fuel injector using a multimeter to ensure it is within specifications.
4. Test the voltage supply to the injector while the engine is running.
5. Examine the ECM for any faults or issues that may affect the injector circuit.

How to fix DTC P0202 step-by-step instructions

To fix DTC P0202, follow these steps:

1. Repair or replace any damaged wiring or connectors related to the injector circuit.
2. If the fuel injector is faulty, replace it with a new one.
3. Ensure that the ECM is functioning correctly replace it if necessary.
4. Clear any stored DTCs using an OBD-II scanner after repairs are made.
5. Test drive the vehicle to ensure the issue is resolved and the Check Engine Light does not reappear.

Recommended tools for OBD-II 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.