P0157 — O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
Category: Powertrain Severity: Low
Updated:
DTC code P0157 means: O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2). It falls under the "Powertrain" category, with an estimated severity of Low. Common causes include faulty bank 2 downstream sensor, exhaust leak and wire shorted to ground; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Faulty bank 2 downstream sensor
- Exhaust leak
- Wire shorted to ground
- Damaged connector
Symptoms
- Check engine light
- No drivability symptoms
How to diagnose it step by step
- Look for exhaust leaks.
- Check the wiring.
- Watch the signal.
- Replace the sensor.
How to fix it
Check for exhaust leaks and the bank 2 downstream sensor wiring; if fine, replace the sensor.
Estimated repair cost
$100–280.
Frequently asked questions
What does DTC code P0157 mean?
O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2).
Is code P0157 serious?
Severity Low. Usually a minor fault; check the causes listed.
Can I keep driving with code P0157?
Yes, it is safe to drive.
Related codes
P0156 P0155 P0153 P0151 P0150 P0161 P0141 P0140 P0171 P0172
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