Circuit Description

WARNING: This page is about a different car, the 2003 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

For circuit description, see DTC P2195: OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK NO. 1 SENSOR NO. 1) & DTC P2196: OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK NO. 1 SENSOR NO. 1) .

DTC detecting conditions for P2237 are:

If AF+ is less than 0.5 V and AF+ is greater than 4.5 V and continues for 5 seconds or more.
If (AF+) - (AF-) is less than 0.1 V and (AF+) - (AF-) is greater than 0.8 V and continues for 5 seconds or more.

DTC detecting conditions for P2238 are:

If AF+ is less than 0.5 V and continues for 5 seconds or more.
If (AF+) - (AF-) is less than 0.1 V and continues for 5 seconds or more.

DTC detecting conditions for P2239 are:

If AF+ is greater than 4.5 V and continues for 5 seconds or more.
If (AF+) - (AF-) is greater than 0.8 V and continues for 5 seconds or more.

DTC detecting condition for P2251 is:

If AF- is 0.5 V or less and AF- is greater than 4.5 V and continues for 5 seconds or more.

DTC detecting condition for P2252 is:

If AF- is 0.5 V or less and continues for 5 seconds or more.

DTC detecting condition for P2253 is:

If AF- is greater than 4.5 V and continues for 5 seconds or more.