Secondary Heated Oxygen Sensor 2 Bank 1 Circuit Signal Stuck Lean

Table of contents

P2270 ACURA Possible Causes

  • Faulty Rear Heated Oxygen Sensor 2 Bank 1
  • Rear Heated Oxygen Sensor 2 Bank 1 harness is open or shorted
  • Rear Heated Oxygen Sensor 2 Bank 1 circuit poor electrical connection

How do I fix code P2270 ACURA?

  Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.

Cost of diagnosing the P2270 ACURA code

  The cost of diagnosing the P2270 ACURA code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P2270 ACURA Description

  The 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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