ToTo17
New Member
1998 Honda Civic Ex Coupe. Does anyone know why my car is running a code P0170 and P0171. We checked for vacuum hoses and were all good. Checked and changed the fuel filter, All header through exhaust gaskets are good, intake is good, all sensors are plugged in correctly, upstream o2 sensor changed, and fuel pressure is fine. The only thing I haven't done was change the downstream or possible faulty ecu. My engine light would sometimes go on randomly and can stay on for a few hours or even days then turn off for a few days or even a week. Sometimes the engine light would do a very light flicker.
