P0159
Low SeverityO2 Sensor Circuit Slow Response (Bank 2, Sensor 2)
Emissions System
P0159 — Instant Answer
O2 Sensor Circuit Slow Response (Bank 2, Sensor 2)
Severity: LOW SEVERITY
Meaning: Downstream O2 sensor bank 2 responds too slowly.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $25 - $80
Most common causes:
- 1. Aging sensor (35-45% of cases)
- 2. Contamination (10-25% of cases)
Common Causes
How to Diagnose P0159
- 1Monitor response rate
- 2Replace if slow
OEM Procedures for P0159
O2 Sensor Circuit Slow Response (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 P0159 O2 Sensor Circuit Slow Response (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 P0159.
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 P0159 on this vehicle.
Related Codes
General fault in the downstream O2 sensor on bank 2.
Downstream O2 sensor bank 2 shows zero activity.
The downstream O2 sensor on bank 1 responds too slowly. This can mask catalytic converter degradation.
Frequently Asked Questions
- Is P0159 urgent?
- No — downstream sensors only monitor the cat. No driveability effect.
- How to test response time?
- With scan tool, the downstream voltage should shift within 300ms of upstream changes.
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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