Can upstream rich running cause P2097?

Yes — if the engine runs rich, unburned fuel passes through the cat and the downstream sensor detects it.

Should I replace the cat for P2097?

Usually no — fix the O2 sensor or upstream rich condition first.

Medium Severity

Emissions System

Fuel system downstream of cat on bank 1 is too rich.

Common Fix

Replace O2 sensor or fix rich condition

Estimated Cost (DIY)

$25 - $200

Faulty downstream O2likely

Rich upstream conditionpossible

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Can upstream rich running cause P2097?: Yes — if the engine runs rich, unburned fuel passes through the cat and the downstream sensor detects it.
Should I replace the cat for P2097?: Usually no — fix the O2 sensor or upstream rich condition first.

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