How To Fix P0040 Code - Upstream O2 Sensor Signals Swapped Bank 1 And 2
Автор: Car Cure
Загружено: 2025-12-24
Просмотров: 56
Описание:
Getting a P0040 code usually means someone mixed up the oxygen sensor plugs during a previous repair. This video shows you exactly how to fix the O2 sensor signals swapped error between bank 1 and bank 2 sensor 1. This almost always happens after engine work where the harness was disconnected. The computer gets confused because it adjusts fuel for one side but sees changes on the other. I show you where these upstream sensors are located near the exhaust manifold and how to trace the wires back to the main harness. You generally do not need expensive tools for this, just a visual inspection to see if the connectors are crossed. I demonstrate how to swap them back to the correct banks and clear the check engine light. This fix restores your fuel economy and stops the engine from running rough.
#obd2 #car #errorcode
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