P0159
Low SeverityO2 Sensor Circuit Slow Response (Bank 2, Sensor 2)
Emissions System
What Does P0159 Mean?
Downstream O2 sensor bank 2 responds too slowly.
Common Fix
Replace O2 sensor
Estimated Cost (DIY)
$25 - $80
Common Causes
How to Diagnose P0159
- 1Monitor response rate
- 2Replace if slow
OEM Diagnostic Flowchart
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0159.
OEM Manual Evidence
Browse →A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti G37 Convertible V6-3.7L (VQ37VHR) Service Manual | Operation CHARM Operation CHARM :...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti G37 Coupe V6-3.7L (VQ37VHR) Service Manual | Operation CHARM Operation CHARM : Car r...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti G37 Sedan V6-3.7L (VQ37VHR) Service Manual | Operation CHARM Operation CHARM : Car r...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti G37x Coupe AWD V6-3.7L (VQ37VHR) Service Manual | Operation CHARM Operation CHARM :...
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.
Related Repair Guides
If your vehicle has triggered P0159, these DIY repair guides may help: