P2096
Medium SeverityPost Catalyst Fuel Trim System Too Lean (Bank 1)
Emissions System
What Does P2096 Mean?
The fuel system downstream of the cat on bank 1 is running lean.
Common Fix
Fix exhaust leak or replace O2 sensor
Estimated Cost (DIY)
$20 - $200
Common Causes
How to Diagnose P2096
- 1Check for exhaust leaks
- 2Test downstream O2 sensor
- 3Check cat efficiency
OEM Diagnostic Flowchart
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P2096.
OEM Manual Evidence
Browse →A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Acadia FWD V6-3.6L Service Manual | Operation CHARM Operation CHARM : Car repair ma...
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A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Savana 1500 RWD V6-4.3L Service Manual | Operation CHARM Operation CHARM : Car repa...
Related Symptoms
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Exact Repair Workflows
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Related Codes
Fuel system downstream of cat on bank 1 is too rich.
The catalytic converter on bank 1 is not converting pollutants efficiently. This is one of the most common DTCs.
Downstream O2 sensor on bank 1 is reading too low. Could indicate a failing sensor or a lean exhaust condition.
Frequently Asked Questions
- Is P2096 the same as P0420?
- Related but different. P2096 is about fuel trim downstream of the cat. P0420 is about cat efficiency. Both can be caused by O2 sensor issues.
- Can an exhaust leak cause P2096?
- Yes — a leak after the cat lets oxygen in, making the downstream sensor read lean.
Related Repair Guides
If your vehicle has triggered P2096, these DIY repair guides may help: