P2251 Code Meaning, Causes, Symptoms & Tech Notes
The diagnostic trouble code P2251 indicates an issue with the O2 sensor negative current control circuit in Bank 1 Sensor 1. The O2 sensor, also known as the oxygen sensor, is a crucial …
P2251 Code: O2 Sensor Negative Current Control Circuit / Open ...
Sep 4, 2023 · Learn what the P2251 code means, its possible causes, and the common symptoms associated with it. Plus learn the best way to approach the issue.
P2251 – Heated oxygen sensor (H02S) 1, bank 1, negative ...
Mar 22, 2021 · Therefore, before attempting to diagnose possible causes of code P2251, be sure to consult reliable service information for the affected application to determine the routing and …
p2251 Code - O2 Sensor Negative Current Control Circuit/Open ...
Most of the time, the problem causing OBD-II code P2251 is an issue with the O2 sensor itself. This may include an open circuit in the heater circuit, a broken wire or connector, an open wire …
P2251 Code: Fixing O2 Sensor Issues on Bank 1 Sensor 1 ...
Jul 18, 2025 · Learn how to diagnose and fix P2251 O2 sensor problems on Bank 1 Sensor 1. Spot symptoms early and prevent costly cat damage.
P2251 Honda Code Meaning, Causes, Symptoms & Tech Notes
Sep 7, 2024 · The P2251 Honda code indicates a problem with the Rear Air/Fuel Ratio Sensor Bank 1 Sensor 1 VS Line High Voltage. This sensor is responsible for monitoring the air-fuel …
P2251 Trouble Code: Meaning, Symptoms, Causes & Fixes
May 9, 2024 · The P2251 trouble code technically means "O2 Sensor Negative Current Control Circuit/Open Bank 1 Sensor 1". Here's exactly what you need to do to fix it.
P2251 O2 Sensor Negative Current Control Circuit/Open Bank 1 ...
A stored code P2251 indicates that the powertrain control module (PCM) has detected a negative current discrepancy in the upstream oxygen (O2) sensor for engine bank number one.