Circuit Description
WARNING: This page is about a different car, the 2003 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
For circuit description, see Circuit Description under DTCs P0031, P0032, P0051 & P0052. DTCs P2195 and/or P2197 are set when air/fuel ratio sensor voltage is greater than 3.8 volts for 10 seconds or more. DTCs P2196 and/or P2198 are set when air/fuel ratio sensor voltage is less than 2.8 volts for 10 seconds or more. Possible causes are:
- A/F sensor circuit is open or shorted.
- Defective A/F sensor.
- Defective A/F sensor heater.
- Defective A/F sensor heater relay.
- Air induction system malfunction.
- Improper fuel pressure.
- Defective fuel injector.
- Defective ECM.