P0172 hyundai elantra 2007

Question

I got p0172 system is too rich bank 1
I checked fuel system , injectors, change spark plugs, test O2 sensor and it work well my STFT -14.8%, LTFT -3.1%  MAP 32 kpa connand EVAP 0.0

Answer 1

Mechanical problem has to be ruled out, low compression with a cylinder can cause a rich running condition fuel being added in the intake through a rupture fuel pressure regulator. Depending on the month of manufactuer this may have timing belt or a timing chain. . If there a timing belt that area should be checked,