P0171 Honda -

Question

98 civic ex I had a code of p0301 originally then I replaced the cap and button as I had replaced the plugs and wires recently. Just to be sure I didn't get a dead plug or bad wire I pulled all the plugs checked them and they look fine. I ran the car at night with the hood up to check for arching from the wires and saw none. Reset the code after replacing cap and button same CEL came back on so I pulled the fuel rail checked the injectors for cleanliness they were filthy so I cleaned them with seafoam now I'm popping up CEL codes p0131, p0170, p0171, and p0174. I'm at a loss as where to go next or the most likely cause. Help please.

Answer 1

P0131 Low voltage in the primary heated 02 sensor

P0170 Fuel trim malfunction Bank 1

P0171 Fuel system too lean

P0174 Fuel trim lean Bank 2

When you say pulled the fuel rail , you pulled the injector with the rail? Check for vacuum leak at the fuel injectors, use brake cleaner or even carburator cleaner and not any change in RPM this would indicate a vacuum leak, P0131 low voltage this is a lean condition it usually is associated with a problem with the fuel. such as the seafoam. You have a vacuum leak that develop,