Honda Civic P0160: O2 Sensor Circuit No Activity Detected (Bank 2, Sensor 2) diagnosis
Code verification standard
P0160 is published with SAE J2012 / ISO 15031-6 code structure plus Honda Civic diagnostic context.
This page covers meaning, symptoms, first checks, live data, misdiagnosis risk, and repair verification.
What does this mean?
Code P0160 indicates that the Powertrain Control Module (PCM) has not detected any voltage activity or fluctuation from the downstream oxygen sensor on Bank 2, Sensor 2. This sensor is located after the catalytic converter on the engine bank that does not contain cylinder #1. Its primary function is to monitor the efficiency of the catalytic converter by comparing its readings with the upstream O2 sensor. A lack of activity suggests the sensor is either faulty, its wiring is compromised, there's an exhaust leak affecting its readings, or the PCM isn't receiving a signal. This can lead to increased emissions and potentially impact fuel economy.
How serious is this code?
While P0160 typically does not pose an immediate safety risk or cause significant drivability issues, it can lead to increased exhaust emissions and reduced fuel efficiency over time. Prolonged driving with this code could also potentially lead to premature catalytic converter degradation due to the PCM not accurately monitoring its efficiency. It's advisable to address the issue promptly to prevent further complications and ensure optimal vehicle performance and emissions compliance.
Diagnostic system: General powertrain circuit
On a Honda Civic, the P0160 code should be diagnosed as part of the general powertrain circuit group. Related codes and live data from this same system can change the repair priority, so avoid replacing parts from the code name alone.
Most Common Causes for Honda Civic
- Faulty oxygen (O2) sensor
- Failed O2 sensor heater circuit
- Damaged, chafed, or broken wiring harness
- Exhaust leak before oxygen sensor
- Failing or clogged catalytic converter
- Corroded or loose electrical connector
- Vacuum leak in intake system
- PCM/ECM software needs update (TSB)
- Internal PCM/ECM failure
Symptoms to Watch For
- Check Engine Light is illuminated
- Decreased fuel economy
- Failed emissions test
- Significant loss of engine power
- Poor acceleration or sluggish response
- Hesitation or stumble during acceleration
Before replacing parts, check these first
- Record freeze-frame data and related codes before clearing the fault.
- Inspect wiring, connectors, vacuum lines, fluid leaks, and fuses tied to the named system.
- Use live data or a multimeter to confirm the failed circuit before replacing parts.
- Check for blown fuses, weak battery voltage, and damaged connectors before buying major parts.
Live data to compare
- Freeze-frame conditions
- Related codes
- Circuit voltage and continuity
How to Diagnose
Common Mistakes
Treating the code description as a parts list instead of verifying the circuit, operating conditions, and related codes. Always confirm the fault with freeze-frame data, live data, visual inspection, and circuit checks before spending money on parts.
Repair verification
After the repair, clear P0160, complete a drive cycle, and confirm the monitor runs without the code returning. Save the before/after scan report if the vehicle needs emissions inspection.
Frequently Asked Questions
Can I drive with the P0160 code?
If the check engine light is solid, you can usually drive to a safe location or mechanic. If the light is flashing, pull over immediately to prevent catastrophic engine or catalytic converter damage.
Will the P0160 code clear itself?
Once the underlying problem is fixed, the engine computer will run its self-checks. If it passes over several drive cycles, the light will turn off automatically. You can also clear it immediately using an OBD2 scanner.
Will this code fail an emissions test?
Yes. If the Check Engine Light is on due to the P0160 code, your Honda will automatically fail an OBD2 plug-in emissions or smog test.
What should I check first for P0160?
Record freeze-frame data and related codes before clearing the fault. Inspect wiring, connectors, vacuum lines, fluid leaks, and fuses tied to the named system. Use live data or a multimeter to confirm the failed circuit before replacing parts.
Join the Discussion
Repair Estimate
Fuse, connector, wiring, cleaning, or basic inspection
Major component replacement after live data and circuit tests confirm failure
Costs vary widely; start with visual inspection and circuit confirmation to avoid unnecessary parts.
DIY Difficulty
Can usually be performed at home with basic hand tools.