Is P0154 the same as P0134 but other bank?

Exactly — P0154 is the bank 2 version of P0134. Same diagnosis, same fix, just on the opposite cylinder bank.

Can this cause engine damage?

No direct damage, but the engine runs in open-loop with poor fuel economy on that bank.

Medium Severity

Emissions System

No activity from the upstream O2 sensor on bank 2. Sensor is likely dead.

Common Fix

Replace O2 sensor

Estimated Cost (DIY)

$30 - $100

Dead O2 sensorlikely

Disconnected wirepossible

Heater failurepossible

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Is P0154 the same as P0134 but other bank?: Exactly — P0154 is the bank 2 version of P0134. Same diagnosis, same fix, just on the opposite cylinder bank.
Can this cause engine damage?: No direct damage, but the engine runs in open-loop with poor fuel economy on that bank.

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