P2626Emissions

O2 Sensor Pumping Current Trim Circuit / Open (Bank 1 Sensor 1)

P2626 means the oxygen sensor pumping current trim circuit for bank 1 sensor 1 is open, affecting the wideband sensor reference used for air-fuel measurement.

🚗 Usually drivable short term. A wideband oxygen sensor trim circuit fault can affect fuel control accuracy and emissions.

MEDIUM

severity

🎯 Top Causes, Ranked by Likelihood

#1Faulty wideband oxygen sensor$150-$450

45%

The wideband sensor pumping cell or trim reference has failed.

#2Open or damaged sensor wiring$100-$350

30%

Broken wiring opens the trim circuit.

#3Corroded connector$80-$250

15%

Corrosion interrupts the trim reference signal.

#4ECM fault$500-$1200

10%

The module circuit that reads the trim has failed.

🩺 Common Symptoms

Check engine light
Poor fuel trim control
Reduced fuel economy
Possible rough running

💰 Repair Cost: DIY vs Shop

DIY Cost

$100-$450

Shop Cost

$250-$700

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P2626

1Inspect the oxygen sensor wiring and connector

2Check the trim circuit for continuity

3Test the wideband sensor operation

4Replace the sensor if the trim reference is out of spec

❓ Frequently Asked Questions

Can I drive with P2626?

Yes for a short time, but fuel control accuracy suffers and it may affect emissions.

Is this the front oxygen sensor?

Yes, bank 1 sensor 1 is the upstream sensor before the catalytic converter.

How much to fix P2626?

Usually $250-$700 including a wideband sensor and labor.

🔗 Related Codes

P0030P0135P0053P2627