Honda element 2004 p0172 system too rich

Question

My mechanic did a valve job on my honda, he adjusted the valves and after two weeks the check engine light appeared, the code was p0172 system too rich, I noticed a sound on the engine part when car gets warm and sometimes check engine comes on and then after a day drive it disappears but then it comes on again, so any suggestions on what it might be or what to ask the mechanic to look for? thanks

Answer 1

You have to be concerned with that noise, Here a step for a P0172, Check fuel pressure regulator , fuel seepage coming out of the fuel pressure regulator will cause a P0172 , if clear and no problem found, check the valve clearance and adjust if necessary. The most important is the timing belt the timing belt auto - tensioner or even the water pump would cause the camshaft timing to be off the mark.