Mercury Grand Marquis Dies After Starting Diagnosis

It can be very disconcerting if your Mercury Grand Marquis is starting and then dies.  It is most likely caused by some type of issue with the electrical or fuel system.  But, there can be other causes as well. Your Grand Marquis’s engine needs 3 things constantly and in the proper proportion to keep running. … Read more

Mercury Grand Marquis: P0171 and P0174 Diagnosis

P0171 and P0174 both indicate that there is a lean condition present in your Mercury Grand Marquis.  By themselves, these are some of the most common OBD2 codes.   When they appear together, it indicates that the entire engine is running lean. Definition Both of these codes are generic, which means they have the same … Read more