The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle. Generally, the problem is in the emissions or something that is affecting the effectiveness of the emissions, but other causes can trigger the light to come on, too. To determine the cause, the vehicle will need to be taken to AutoZone or a shop that has an OBD2 scanner, or for 1995 and earlier models, an OBD1 scanner, While a scanner will not give you the magic answer, it will give you a code that narrows down the problem area.
The 2002 Pathfinder oxygen sensors are critical part of the engine management system. You can find the oxygen sensors in the exhaust system.
air flow sensor
Indicative of problem with engine emission system
were is the engine management technology at on your engie
Check engine light refers to the emission system - have vehicle scanned to determine problem
The light is one because there is a problem with the emissions system. Once the problem is corrected the service tech will reset the light.
There is a problem with the emissions system. Need to have engine scaned with a engine scanner, and it will tell you were the problem is and whats going on.
It is on because the ECU has detected a problem with the emissions system.
acura cl 2002 check engine light
It is reset with a OBD2 scan tool, after the repair of the system.
Usually a problem with the emission control system - have vehicle scanned to determine the problem
On a 2002 Ford Expedition : The " check engine " light is the " SERVICE ENGINE SOON " light just to the left of the fuel gauge