P2270 ACURA - Secondary Heated Oxygen Sensor 2 Bank 1 Circuit Signal Stuck Lean
P2270 Acura DescriptionThe secondary HO2S detects the oxygen concentration in the exhaust gas downstream of the three-way catalyst (TWC). The sensor output voltage characteristics are similar to the Air/Fuel ratio (A/F) sensor. The oxygen concentration is detected after the TWC during fuel feedback control using the A/F sensor, and it optimizes the fuel feedback control to maximize the effect of the TWC. If, after current is applied to the secondary HO2S heater, the secondary HO2S does not fluctuate and the output is stuck within the specified area, a malfunction is detected and a Diagnostic Trouble Code (DTC) is stored.
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