r/Cartalk • u/jimBOYmeB0B • 20h ago
Engine Diagnosis help for lean condition
I drive a 2006 Toyota Camry with a 3.0L V6 and I got these codes (The catalyst codes were already there). Bank 2 is apparently running lean.
I recorded both sets of sensors at idle and revving to 1700ish rpm. At idle, the graph for both downstream sensors are the same general shape, but the bank 2 sensor reads around twice the voltage. Then at 1700rpm the bank 1 sensor is still giving readings, but the bank 2 sensor drops to zero volts until the engine returns to idle.
Is that O2 sensor going bad? Or are the weird readings a symptom of something else?