How to diagnose, repair, and info on causes of a P0438 engine code which involves the bank 2 sensor 1 catalyst temperature oxygen sensor circuit which is high. Also includes links to relevant forum topics on the code.

Jan 24, 2024 · The P0438 code indicates an issue with the catalyst efficiency of engine bank 2. Symptoms may include decreased engine performance, hesitation while accelerating, or stalling. Diagnosing the P0438 code requires the use of a scanner, volt/ohmmeter, and temperature gun.

The P0438 code indicates that the Catalyst Temperature Sensor for Bank 2 Sensor 1 is registering a high input. This sensor is responsible for monitoring the temperature of the catalytic converter, which plays a crucial role in reducing harmful emissions from the vehicle.

OBD-II Code P0438 implies that there is an issue with the temperature sensor in the catalytic converter, specifically on the second bank of the engine. Bank 2 refers to the firing order of the cylinders, which helps identify which side of the engine the problem is occurring.

Jan 29, 2025 · The P0438 code is a diagnostic trouble code (DTC) that signals an issue with the catalyst temperature sensor circuit. Specifically, it pertains to Bank 2 Sensor 1 in your vehicle. This sensor plays a crucial role in monitoring the temperature of the catalytic converter.

Apr 18, 2019 · Code P0438 Description. The Engine Control Module (ECM) monitors the Catalyst Temperature Sensor Circuit Performance, which measures the temperature of the catalyst. Catalyst Temperature Sensor function by increasing …

P0438 is a diagnostic trouble code (DTC) for "Catalyst Temperature Sensor High (Bank 2)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation.

Sep 5, 2024 · The P0438: Catalyst Temperature Sensor Circuit High (Bank 2, Sensor 1) refers to an issue with the high input signal from the catalyst temperature sensor located on Bank 2, Sensor 1. This problem is typically caused by a faulty …

What does OBD-II fault code P0438 mean? OBD-II Code Catalytic converter temperature sensor failure is defined as a Catalyst Temperature Sensor Circuit High. The Catalytic Converter uses …

The optical sensor provides a high resolution signal to the Powertrain Control Module (PCM) by counting pulses on the sensor disk located in the injection pump. The high resolution is one of the most important inputs by the PCM for fuel control and timing.