P0202 OBD Error Code: Problem & Solutions

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A direct impact on the fuel delivery system can cause immediate loss of power from the engine due to multiple reasons of malfunction and directly impacting the amount of fuel entering the engine for combustion. Any mismatch in the fuel to air ratio will directly result in loss of power form the engine and record P0202 error code in the PCM after detection of the problem. Check Engine Light is usually the first indication of this OBD Error code P0202

This OBD code in a generic trouble code and applies to all vehicles having OBD-II or vehicles made from 1996 to present. The specification, troubleshooting and repairs may vary according to different make and model.

OBD code P0202 is defined as Cylinder 2 Injector Circuit Malfunction. This error code is set by the PCM/ECM if it detects low or high voltage drop or resistance in the fuel injector of cylinder 1. Special transistors, called ‘drivers’ are used by PCM to operate the fuel injector On and Off in the fuel injection system. If it doesn’t see the injector voltage close to battery voltage, i.e. high, it will set P0202 error code. Also if the PCM notices that the resistance of higher or lower than the expected range for the cylinder 1 fuel injector, the OBD code P0202 error code will set.

What causes the problem of Cylinder 2 Injector Circuit Malfunction?

• Faulty/damaged Fuel Pump
• Exhaust leaks
• Faulty wiring and connection in relation to sensor and regulators
• Fuel Pressure Regulator faulty
• Faulty ECM/PCM
• Faulty Fuel Injectors
• Restricted or Clogged Fuel Filters

1. Engine Control Module - OBD Error Code P0202 can also be due to faulty EVMs. It’s better to get the faulty electricals replaced as soon as possible. Replace faulty ECM today!
2. Powertrain Control Module - P0202 error code also relates to problems with the powertrain which can store and flash wrong error code. Find all the Powertrain related parts with us.
3. Diagnostic Tool - In order to detect the error, one needs high grade diagnostic tools. Visit us today to grab amazing deals.
4. Fuel Injector - A faulty fuel injector will affect the engine’s fuel to air ratio and thus the engine performance. Replace it now!
5. Engine Wiring Harness - Faulty wirings can also to the reason for under performance of certain components of the fuel delivery system. Check and replace faulty components now!
6. Fuel Sender Connector - If the connector is damaged, then the fuel delivery system will get affected and thus, it must be replaced. Buy new components for us!
7. Battery & Electrical System - Check for any faults with the battery and electricals and replace them immediately.

Most common symptoms for OBD code P0202 include a no start condition, extended cranking before engine starts, hesitation upon acceleration, and decreased fuel mileage, along with a stored trouble code and malfunction indicator lamp illumination. Other codes will also likely accompany this type of code including engine misfire codes, lean and/or rich exhaust codes, and mass airflow sensor codes.

Common Symptoms

• Decreased power and acceleration
• Engine is stalling or hesitation on acceleration
• Engine dies or is difficult to start
• Affected fuel economy

• Fuel Injector Replacement
• Spark Plug Replacement
• Fuel filter replacement
• PCM Replacement
• Fixing Damaged/Faulty Wiring and Connections

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Follow the diagnostic steps properly to resolve the OBD code P0202 error.

• Use quality diagnostic tools like OBD-II scanner, DVOM, and automobile stethoscope to treat P0202 error code.
• Inspect for the faulty wiring and connectors that may be damaged, broken or corroded and replace them immediately.
• PCM used other input signals from various engine sensors to develop a fuel delivery strategy. As voltage from the PCM gets increased, the fuel pressure regulator actuator allows pressure from the fuel pump to build and as voltage from the PCM is decreased, fuel pressure gets restricted.
• Retest the system after repairs are completed to ensure that the OBD code doesn’t reappear. If all system wiring, connectors, and components appear to be in normal working order, connect the scanner to the diagnostic connector and record all stored codes and freeze frame data.
• Check for the faults in the fuel pump, and the fuel injection system for any possible leaks and the thus need replacement as required. Also check for damaged or clogged fuel filters and replace them if needed.
• If everything checks out to be ok, suspect for the problem with the PCM and thus replace or repair accordingly.

 Common mistakes when diagnosing the P0202 code

Never skip the diagnostic steps and follow the order provided properly or otherwise can lead to misdiagnosis and unnecessary repairs and costs, which could have been avoided. Also check for the following parts for errors or faults;

• Damaged or contaminated spark plug
• Fuel pressure sensor failure
• Exhaust leakages
• Fuel injector failure
• Fuel pump failure
• Internal engine failure
• Powertrain Control Module (PCM) software needs to be updated
• The fuel not meeting the manufacturer's requirements