P0130 Code: O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
🟠 Moderate severity · drivable
Drivable, but the upstream sensor controls the fuel mixture, so economy and running will suffer until it's fixed.
What P0130 means
The bank 1 upstream oxygen sensor (the one before the catalytic converter) isn't producing a usable signal. Because this sensor directly controls the air/fuel mixture, a P0130 can make the engine run rich or lean and hurt fuel economy.
Symptoms
- Check engine light on
- Poor fuel economy
- Rough or surging idle
- Possible failed emissions test
Common causes
- most common: Faulty upstream oxygen sensor
- common: Exhaust leak before the sensor
- less common: Damaged sensor wiring or connector
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the bank 1 upstream oxygen sensor | Yes | $60–200 |
| Repair an exhaust leak before the sensor | Mechanic | $50–200 |
Frequently asked questions
What does bank 1 sensor 1 mean?
Bank 1 is the side of the engine with cylinder 1, and sensor 1 is the upstream sensor before the catalytic converter — the one that controls your fuel mixture.
Can I drive with a P0130?
Yes, but fuel economy will likely suffer because the computer has lost its main fuel-control signal.
How much does it cost to fix P0130?
Typically $60–$200 for a new upstream oxygen sensor.
Related codes
P0133
P0133 Code: O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
P0135P0135 Code: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0171P0171 Code: System Too Lean (Bank 1)
Related guide: MAF Sensor Replacement Cost →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.