code p0170 wtf is this!?

[silversol]

1999 honda civic it does not have a check engine light on but i was checking readyness with my scaner an saw i have a code po170 pending. what is this for?

[Tech5]

fuel trim, could be many things,
Bad O2 sensor,
vac leak,
weak fuel pump,
ECU,
injector,
timing ,
etc

[silversol]

fuck where to start!

[Barefoot]

fuck where to start!

o2 timing and vac but thats just me. all easy scan tool will tell u about the o2. timing easy to check no need to explain. as for vac leaks some brake parts cleaner.

[fly-n-low]

My CEL was on when mine popped up. I replaced my secondary O2 sensor and that fixed the problem. A week later the code popped up for my Primary O2 sensor and replaced that one as well.

[dorin48]

p0170 is a lean condition on bank 1. You only have one bank of cylinders so thats easy. Most common problem that throws this code is a clogged/old fuel filter.

[fly-n-low]

I also forgot to mentio that at the same time I replaced my O2 sensor I also adjusted my valves. Check your compression/Leak down levels to see if one of them is out of specs. Could be a valve is too tight/loose. Tech book recommends this before other troubleshooting.

[Turbd4DE]

This may help http://users.skynet.be/MRS/MR/guide/...tics/DI-77.pdf