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.

Medium Severity

Emissions System

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

Exhaust leak after catlikely

Faulty downstream O2 sensorpossible

Catalytic converter issuepossible

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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.

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