The engine code C1218 OBD2 may also be generated by burdens earlier down the line. Such as, a dirty MAF sensor might be producing the car to dramatize in its fuel-trim adjustments. So, the oxygen sensors are likely to story fuel mix problems. The C1218 engine code seems a sort of chassis problem and it is easy to fix. The valves of individual cylinder are kept shut by a pair of arms that change the predictable engine’s roller-type rocker arm. The engine C1218 code is one of these arms follows the cam profile while the 2nd arm joins to the valves. During normal engine operation the 2 arms are combined by a locking pin.