P0160 Code – O2 Sensor Circuit No Activity Detected

The P0160 diagnostic trouble code indicates that the Engine Control Unit (ECU) has detected no activity from the oxygen (O2) sensor located on Bank 2 Sensor 2.

This sensor is positioned downstream of the catalytic converter and is responsible for monitoring catalytic converter efficiency.

Under normal conditions, the sensor produces a voltage signal that reflects oxygen levels in the exhaust. When the ECU detects no signal change or a constant flat reading, it stores the P0160 code.

Symptoms of Code P0160

Common symptoms include:

• Check Engine Light illuminated

• Increased emissions

• Possible failure of emissions inspection

• Typically no noticeable drivability issues

Since this is a downstream sensor, engine performance is usually unaffected.

Common Causes of P0160

Typical causes include:

• Faulty or failed O2 sensor (Bank 2 Sensor 2)

• Open circuit (broken wire)

• Disconnected or damaged connector

• Wiring harness damage due to heat

• Sensor heater circuit failure

• ECU issue (rare)

How Serious Is Code P0160

The P0160 code is considered a low to moderate severity issue.

The vehicle remains drivable, but:

• emissions monitoring is compromised

• catalytic converter efficiency cannot be properly evaluated

• inspection failure is very likely

Repair is recommended.

How to Diagnose Code P0160

Diagnosis typically involves:

1. Scanning the vehicle with an OBD2 tool

2. Monitoring live O2 sensor data

3. Checking for constant or zero voltage

4. Inspecting wiring and connectors

5. Testing sensor power, ground and heater circuit

6. Verifying ECU signal

A flat or inactive signal confirms the fault.

How to Fix Code P0160

Common repair solutions include:

• Replacing the O2 sensor (Bank 2 Sensor 2)

• Repairing open circuits or damaged wiring

• Replacing or securing connectors

• Fixing heater circuit issues

• Clearing the fault code after repair

In most cases, replacing the sensor resolves the issue.

Vehicles Commonly Affected

The P0160 code may appear on vehicles with multiple cylinder banks, including:

• BMW

• Mercedes-Benz

• Audi

• Ford

• Toyota

• Nissan

FAQ – P0160 Code

Can I drive with code P0160?

Yes, but emissions monitoring is affected.

What does “no activity” mean?

It means the sensor is not sending any usable signal to the ECU.

Is this usually a bad sensor?

In most cases, yes, but wiring and connectors should also be checked.