What does code P0140 mean?

P0140 — No signal from Bank 1 Sensor 2 (open circuit). Sensor sends no signal to ECM at all. Belongs to the powertrain.sensor system. Severity: warning.

What are the common causes of P0140?

Break in signal wire; Internal break inside the sensor; Corroded or fell-apart connector; Wiring damage from contact with hot exhaust; Broken or missing heater wire

Can I drive with code P0140?

Limited: reaching the nearest workshop is fine, but avoid long trips. May progress into a more serious fault.

How do I diagnose P0140?

Read the code and freeze-frame with a scanner, check related-system errors, inspect the components listed (wiring, connectors, sensors). See the "How to diagnose" section above for the full step-by-step.

How do I clear code P0140?

The code can be cleared via an OBD-II scanner (e.g. ELM327 + the Car Diagnostics app): plug the adapter into the OBD port, go to Errors → Clear. If the underlying cause isn't fixed, the code will return within a few drive cycles.

OBD-II Code P0140 — Car Diagnostics Platform

What it means

Common causes

Break in signal wire
Internal break inside the sensor
Corroded or fell-apart connector
Wiring damage from contact with hot exhaust
Broken or missing heater wire
Aftermarket dummy/spacer installed without proper sensor

How to diagnose

01
Read all stored and pending codes with an OBD-II adapter — get the full picture, not just the one code.
02
Capture freeze-frame data (RPM, coolant temperature, engine load) at the exact moment the code triggered.
03
Inspect the named subsystem with our app's AI explanation — get vehicle-specific causes for your make, model and year.

Decode P0140 on your actual car

Plug in an OBD-II adapter and get an AI-powered diagnosis tailored to your vehicle make, model and year — in 30 seconds.

Try the demo