What it means
Same condition as P0132 but on bank 2. The upstream sensor reports a continuously rich condition or has a short to supply voltage.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Bank 2 Sensor 1 is the upstream oxygen sensor feeding fuel-control information for Bank 2. P0152 sets when its signal voltage remains higher than expected, which can mean genuinely rich exhaust or a signal wire shorted to voltage.
Common causes
Most likely first.
- Bank 2 running rich (leaking injector, high fuel pressure)
- Signal wire shorted to supply voltage
- Connector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
How to diagnose it
- Check freeze-frame data and compare Bank 2 Sensor 1 live readings with fuel trims and the other bank to determine whether Bank 2 is actually running rich.
- Inspect the sensor connector and harness for corrosion, loose pins, heat damage, or a signal wire contacting a power feed.
- If data indicates rich running, check for causes such as a leaking Bank 2 injector or excessive fuel pressure using the manufacturer's procedure.
- Test the signal circuit for a short to supply voltage and verify sensor operation according to the manufacturer's wiring information.
- Replace the sensor only if circuit and mixture checks show the sensor itself is not reporting correctly.
Common fixes
- Repair a shorted Bank 2 Sensor 1 signal wire or damaged connector.
- Correct confirmed rich-running causes such as a leaking injector or fuel-pressure fault.
- Clean or repair corroded connector terminals.
- Replace Bank 2 Sensor 1 if it fails the manufacturer's circuit and response tests.
Can I keep driving?
Limit driving if fuel use rises sharply, the exhaust smells of fuel, or the engine runs roughly; prolonged rich running can damage the catalytic converter. If it runs normally, keep any necessary trip short and gentle.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.