P0160 is an OBD-II trouble code indicating that the Engine Control Module (ECM/PCM) has detected insufficient activity or a lack of expected voltage variation from the oxygen sensor circuit for Bank 2 Sensor 2.
Bank 2 Sensor 2 is normally the downstream oxygen sensor located after the catalytic converter. The exact location, wiring, and diagnostic procedure depend on the vehicle's year, engine, and manufacturer.
P0160 Location by Manufacturer
On engines with multiple cylinder banks, Bank 2 is normally the bank opposite the cylinder bank containing cylinder number 1. Sensor 2 normally refers to the downstream oxygen sensor located after the catalytic converter.
Chevrolet / GMC
On applicable trucks and SUVs, check the Bank 2 Sensor 2 wiring, connector, sensor power supply, and related O2 sensor fuse where equipped. Also inspect wiring near hot exhaust components for heat damage.
Nissan / Infiniti
Inspect the downstream sensor wiring and connectors carefully, particularly around the exhaust and catalytic converter area. The exact sensor position varies by engine.
Toyota / Lexus
Verify the correct sensor specification and connector configuration before replacement. Use an OEM or properly matched OEM-equivalent sensor for the specific application.
Jeep Wrangler / RAM
Inspect the downstream O2 sensor connector and harness for water, mud, corrosion, or physical damage, especially on vehicles used frequently off-road.
BMW
Check the downstream oxygen sensor, wiring, connector, and heater circuit according to the specific engine's diagnostic procedure. Sensor compatibility is also important when replacing the component.
Important: These are general manufacturer-specific considerations, not guaranteed causes for every vehicle. Always verify the exact year, engine, wiring diagram, and service information before making a diagnosis.
Bank 1 Sensor 1 vs. Bank 2 Sensor 2
Bank 1 Sensor 1
Normally the upstream oxygen sensor located before the catalytic converter on the cylinder bank containing cylinder number 1.
Bank 2 Sensor 2
Normally the downstream oxygen sensor located after the catalytic converter on the second cylinder bank.
Symptoms of P0160
Check Engine Light
The Check Engine Light may illuminate after the ECM detects insufficient sensor activity.
Poor Fuel Economy
Fuel economy may be affected depending on the vehicle's control strategy and the underlying cause.
Rough Running
Some vehicles may experience hesitation, rough idle, or reduced performance when another engine problem is present.
Increased Emissions
A failed downstream oxygen sensor can affect emissions monitoring and may cause an emissions inspection failure.
Common Causes of P0160
Faulty O2 Sensor
The Bank 2 Sensor 2 oxygen sensor may fail internally and stop producing the expected signal activity.
Broken or Melted Wiring
Heat damage, broken wires, or physical harness damage can interrupt the sensor circuit.
Blown Sensor Fuse
On vehicles that use a fuse for the O2 sensor heater or related circuit, a blown fuse can prevent proper sensor operation.
Corroded Connector
Corrosion, moisture, loose terminals, or damaged connector pins can interrupt the sensor circuit.
Lost Ground or Power
A missing power or ground supply can prevent a heated oxygen sensor from operating correctly.
Exhaust or Engine Problem
An exhaust leak or underlying engine problem can affect oxygen sensor operation and should be considered during diagnosis.
Estimated Repair Cost for P0160
O2 Sensor Replacement
$100–$300 approximately, depending on the vehicle, sensor, and labor.
Wiring Repair
$50–$250 approximately, depending on the location and extent of damage.
Connector Repair
$50–$200+ depending on the connector and labor required.
Exhaust Repair
$100–$500+ depending on the leak location and parts required.
These are general estimates only. Actual repair costs vary by vehicle, parts, labor rate, and the cause of P0160.
How to Fix P0160
The correct repair depends on why Bank 2 Sensor 2 is showing no expected activity. Diagnose the electrical circuit and sensor before replacing components.
- Scan for additional stored and pending trouble codes.
- Check the freeze-frame data when available.
- Inspect the Bank 2 Sensor 2 wiring and connector.
- Check for melted, broken, or corroded wiring.
- Check the relevant O2 sensor fuse where applicable.
- Verify sensor power and ground circuits according to the vehicle wiring diagram.
- Check the sensor signal using live data or appropriate testing equipment.
- Replace the oxygen sensor if testing confirms that it has failed.
- Clear the code and verify that the fault does not return after the required drive cycle.
Common Repair Mistakes
Replacing the Sensor Immediately
P0160 does not automatically prove that the oxygen sensor itself is defective.
Ignoring the Fuse
On applicable vehicles, a blown O2 sensor fuse can prevent proper sensor operation.
Ignoring Wiring Damage
Exhaust heat, rubbing, water, and physical damage can interrupt the sensor circuit.
Replacing the Wrong Sensor
Confirm Bank 2 Sensor 2 before removing or replacing an oxygen sensor.
Using an Incorrect Replacement Sensor
Verify the connector, specifications, and compatibility before installing a replacement sensor.
Clearing the Code Only
Clearing P0160 does not repair the physical problem. If the fault remains, the ECM can set the code again after completing its diagnostic checks.
Related OBD-II Codes
P0156
Oxygen Sensor Circuit Malfunction, Bank 2 Sensor 2. Indicates a general circuit malfunction involving the same downstream sensor.
P0157
Oxygen Sensor Circuit Low Voltage, Bank 2 Sensor 2. Indicates a lower-than-expected sensor circuit voltage.
P0158
Oxygen Sensor Circuit High Voltage, Bank 2 Sensor 2. Indicates a higher-than-expected sensor circuit voltage.
P0159
Oxygen Sensor Slow Response, Bank 2 Sensor 2. Indicates that the sensor response is slower than expected.
P0161
Oxygen Sensor Heater Circuit Malfunction, Bank 2 Sensor 2. Indicates a problem with the heater circuit of the same sensor.
Recommended Diagnostic Tools
OBD-II Scan Tool
Used to read P0160, additional codes, freeze-frame data, and live oxygen sensor information.
Digital Multimeter
Used to check power, ground, continuity, and electrical circuit conditions.
Wiring Diagram
Helps identify the correct sensor pins, power circuits, grounds, and ECM connections.
Oscilloscope
Useful for advanced testing of the oxygen sensor signal and circuit activity.
O2 Sensor Socket
Useful for removing and installing the oxygen sensor after the diagnosis confirms replacement is necessary.
P0160 FAQ
What does code P0160 mean?
P0160 means the ECM has detected insufficient activity or expected voltage variation from the Bank 2 Sensor 2 oxygen sensor circuit.
What causes an O2 sensor to have no activity?
Possible causes include a failed sensor, damaged wiring, a blown sensor fuse where applicable, corroded connectors, or a missing power or ground connection.
Where is Bank 2 Sensor 2 located?
It is normally the downstream oxygen sensor after the catalytic converter on Bank 2. The exact location depends on the vehicle's year and engine.
Can I drive with P0160?
If the engine is running normally and there are no severe drivability symptoms, the vehicle may usually be driven for a short period. However, the fault should be diagnosed promptly because it can affect emissions and may indicate an electrical or sensor problem.
Will clearing P0160 fix the problem?
No. Clearing the code only removes the stored fault temporarily. If the underlying problem remains, the ECM can set P0160 again after completing the required diagnostic monitoring conditions.
Should I replace the oxygen sensor first?
Not necessarily. Check the wiring, connector, power, ground, fuse where applicable, and sensor signal before replacing the component.
Can P0160 cause poor fuel economy?
It can, depending on the vehicle's control strategy and the underlying problem. A downstream sensor fault does not always cause a noticeable fuel economy change.
Final Result
P0160 indicates insufficient activity from Bank 2 Sensor 2. The most reliable diagnosis is to inspect the sensor, wiring, connector, power and ground circuits, and any related faults before replacing components.