What is P2238 : Engine Error code Causes Explained
The P2238 engine error code indicates an oxygen sensor circuit fault that may reduce fuel economy and increase emissions. Identifying its causes and remedies can assist preserve engine efficiency and save costly repairs.
How to Identify a DTCs Number
The Diagnostic Trouble Code (DTC) P2238 is related to the oxygen sensor, specifically the O2 Sensor Positive Current Control Circuit Low (Bank 1, Sensor 1). To identify this DTC, you need an OBD-II scanner, which will retrieve the code from the vehicle’s ECM.
Understand, this trouble codes (DTCs) are 5 characters: 1 letter, 4 numbers. P-Powertrain indicates the fault code’s location. Generic or manufacturer-specific codes are indicated by the first digit. The second digit denotes the subsystem (7=transmission). The last two numbers describe the issue.
Once connected, the scanner communicates with your engine control module (ECM) to retrieve any stored error codes, including P2238.
Causes of P2238 Error Code:
- Faulty Oxygen Sensor:
A defective 02 sensor is the most common cause, failing to regulate voltage properly. - Damaged or Corroded Wiring:
Damaged wiring in the 02 sensor circuit can cause low voltage and trigger the code. - Blown Fuse or Faulty Relay:
A blown fuse or faulty relay can cut power to the 02 sensor, triggering the code. - Exhaust Leaks:
Leaks near the O2 sensor cause incorrect readings and affect performance. - Vacuum Leaks:
Vacuum leaks can cause incorrect air-fuel ratio readings, affecting 02 sensor output.
Risk Level of P2238 Error Code:
A medium risk level means the issue is not immediately catastrophic but can lead to poor engine performance, increased emissions, and potential long-term damage if ignored. It’s best to diagnose and repair the issue as soon as possible.
Common Car Brands Affected by P2238 Code:
The P2238 engine error code is commonly found in the following list.
- Ford
- Volkswagen
- Hyundai
- Honda
- Chevrolet
- Toyota
- Nissan
Video: P2238 Engine Error code
FAQ’s
What is the P2238 Error Code?
The P2238 code indicates an issue with the Oxygen (O2) Sensor Positive Current Control Circuit, typically affecting fuel mixture regulation.
What Causes the P2238 Error Code?
It is usually caused by a faulty O2 sensor, wiring issues, Vacuum Leaks, or exhaust leaks.
What is the Risk Level of the P2238 Code?
The risk level is medium, as it may cause engine performance issues but does not immediately threaten vehicle safety.
Which Vehicles Are Affected by P2238?
It commonly affects Ford, Volkswagen, Hyundai, Honda, Chevrolet, Toyota and Nissan and other vehicles using advanced O2 sensor systems.