Question 1

What does P0134 mean?

Accepted Answer

P0134 - O2 Sensor No Activity (Bank 1 Sensor 1). Upstream O2 sensor on bank 1 showing no activity — flat voltage, not switching.

Question 2

What are the symptoms of P0134?

Accepted Answer

Check engine light, Poor fuel economy, Engine in open loop (rich)

Question 3

What causes P0134?

Accepted Answer

Failed O2 sensor, Heater circuit failure, Wiring open circuit, Exhaust leak diluting readings, Connector corrosion

Question 4

How much does it cost to fix P0134?

Accepted Answer

Typical repair cost: $80-$300. No activity usually means dead sensor. Check connector first.

P0134 — O2 Sensor No Activity (Bank 1 Sensor 1)

Don't guess — diagnose P0134 the right way