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CHECK ENGINE LIGHT AFTER 02 SENSOR CHANGE (code 45 injector leak or other fuel/injection codes)


MY1PATH
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Just some useful information I thought I'd share. Sometimes after replacing an old o2 sensor you will start getting CEL code 45 injector leak (sometimes other fuel related codes). Before you waste time and money fussing with your injectors you should reset the ECU with a 24 hour unplug. Because you may not really have a problem at all. This can be done but disconnecting the battery or by getting under the seat and carefully unscrewing and removing the ECU connector from the ECU. The latter preserves your clock and radio settings but is a little bit harder to get to.
 
WHY? The FSM won't tell you this but Just resetting/Clearing codes won't work here because it does not clear the rest of the ECU memory. The ECU uses a trim feature to adjust your fuel based on o2 sensor feedback. The trims change as the o2 sensor ages and when a new sensor in place the trims may be too far off (usually because the old sensor was telling the ECU to run richer) so the ECU thinks there is an injector leaking. Doing a 24 hour unplug resets these trims so the ECU can establish a new baseline. 
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