P0157
Low SeverityO2 Sensor Circuit Low Voltage (Bank 2, Sensor 2)
Emissions System
P0157 — Instant Answer
O2 Sensor Circuit Low Voltage (Bank 2, Sensor 2)
Severity: LOW SEVERITY
Meaning: Downstream O2 sensor bank 2 reads low voltage.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $25 - $80
Most common causes:
- 1. Failed sensor (35-45% of cases)
- 2. Exhaust leak after cat (10-25% of cases)
Common Causes
How to Diagnose P0157
- 1Monitor sensor voltage
- 2Check for exhaust leaks
- 3Replace sensor
OEM Procedures for P0157
O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2) Found 58 OEM service manual procedures.
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
11 51 000 Removing and installing/replacing the coolant pump (X5 M) - Replacement: Prepare the coolant pump
Showing 8 of 58 procedures
OEM Diagnostic Flowchart
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Parts & Tools for This Job
Common parts shoppers buy for P0157 O2 Sensor Circuit Low Voltage (Bank 2, Sensor 2).
Oxygen Sensor
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Catalytic Converter
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EVAP Purge Valve
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Gas Cap
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OBD2 scanner
Read codes and freeze-frame data before you guess at the fault.
Most diagnostic jobs start with a scan tool and a verified code path.
Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsReady to fix it yourself?
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0157.
OEM Manual Evidence
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Related Symptoms
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Exact Repair Workflows
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Open the exact repair flow most commonly associated with P0157 on this vehicle.
Related Codes
General fault in the downstream O2 sensor on bank 2.
Downstream O2 sensor bank 2 reads high (rich).
Downstream O2 sensor on bank 1 is reading too low. Could indicate a failing sensor or a lean exhaust condition.
Frequently Asked Questions
- Is P0157 just like P0137?
- Yes — same problem, other bank. P0137 is bank 1, P0157 is bank 2.
- Do I need to fix this?
- Only needed for emissions testing. No driveability impact.
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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29