P0140
O2 Sensor Circuit No Activity Bank 1 Sensor 2
2003-2003 Jeep Wrangler 2.4L I4
Moderate SeverityPowertrainGeneric (SAE)
The 2003 Jeep Wrangler is equipped with a 2.4L inline-4 engine. Below you'll find detailed p0140 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The downstream O2 sensor on Bank 1 shows no switching activity.
Symptoms
- Check Engine Light
- No catalyst monitoring
Common Causes
- Faulty sensor
- Heater circuit failure
- Wiring open
Diagnostic Steps
- Test sensor voltage
- Check heater
- Inspect wiring
Repair Notes
Replace downstream O2 sensor.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0140 on Other Vehicles
Common Questions
What does code P0140 mean on a 2003-2003 Jeep Wrangler?
P0140 stands for "O2 Sensor Circuit No Activity Bank 1 Sensor 2". The downstream O2 sensor on Bank 1 shows no switching activity.
What are the symptoms of P0140 on a Jeep Wrangler?
Common symptoms of P0140 include: Check Engine Light, No catalyst monitoring.
What causes P0140 on a 2003-2003 Jeep Wrangler?
Common causes of P0140 include: Faulty sensor, Heater circuit failure, Wiring open.
Last updated: March 2026