What Does P2272 Mean?
The downstream oxygen sensor on Bank 2 is reading consistently lean or stuck reading lean values. This sensor monitors catalytic converter efficiency on the second cylinder bank.
Common Causes
40%
Failed or contaminated Bank 2 Sensor 2 oxygen sensor
30%
Exhaust leak before Bank 2 Sensor 2 location
15%
Damaged or corroded oxygen sensor wiring/connector
10%
Fuel delivery issue to Bank 2 cylinders causing lean condition
5%
Vacuum leak affecting Bank 2 cylinders
Diagnostic Steps
1
Step 1: Monitor live oxygen sensor voltage for Bank 2 Sensor 2; verify stuck lean reading (typically below 0.45V)
2
Step 2: Inspect Bank 2 exhaust system for leaks before sensor; check manifold gaskets and connections
3
Step 3: Check Bank 2 oxygen sensor wiring and connector for damage or corrosion
4
Step 4: Compare Bank 1 and Bank 2 fuel trims; significant difference may indicate Bank 2-specific issue
5
Step 5: Test sensor response or replace Bank 2 Sensor 2 oxygen sensor if wiring and exhaust are intact
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The downstream oxygen sensor on Bank 2 is reading consistently lean or stuck reading lean values. This sensor monitors catalytic converter efficiency on the second cylinder bank.
The most common cause of P2272 (O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 2) is: Failed or contaminated Bank 2 Sensor 2 oxygen sensor
Typical repair costs for P2272 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but affects emissions compliance. May indicate lean condition that could cause engine damage if left unaddressed long-term.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2272 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control / Fuel System
Difficulty
Type
Generic (SAE)
Recommended Tools
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