01 U0019 Low Speed CAN Communication Bus • 02 B0040 - Left Front or Driver Side Deployment Loop Resistanc… • 03 You Might Stall On The Highway If You Keep Ignoring That Ra… • 04 10 Common DTC Codes: Causes, Troubleshooting, and Repair • 05 The Right Way to Charge EV Batteries: Lessons from Stanford… • 06 Fuel Pressure Regulator Issues: Symptoms and Repairs • 07 How Reliable are BMW Cars? A Comprehensive Guide for Car Bu… • 08 What happens if you put petrol in a diesel engine? • 09 How to Fix an Engine That Cuts Out and Restarts While Drivi… • 10 The Best Oil for Older Diesel Engines: Buyer's Guide •

DTC codes / P26xx · Computer and output circuits / P2627

P2627O2 Sensor Pumping Current Trim Circuit Low (Bank 1 Sensor 1)

P2627 means the engine computer has detected that the electrical current trim signal for the oxygen sensor's pumping circuit on Bank 1 Sensor 1 is lower than expected. This sensor is a wideband air-fuel ratio sensor that uses a pump cell to balance oxygen ions, and the trim circuit fine-tunes that pumping current; a low reading tells the computer the circuit is not drawing enough current, which can skew the air-fuel ratio feedback.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaComputer and output circuits

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage