2005 Mercury Mariner Q&A

2005 Mercury Mariner Question: Will not go faster than 35 mph, emission light on also

The emission light has been on for a while, then one day, was at highway speed, slowed to 35 mph an would not go faster. -
Answer 1
have the cat converter check for back pressure failure and have the fuel pressure checked. this is why it is an issue with leaving on the check engine light for a long period of time. we always recommend repairing the car when the light comes on as more damage may result not attending to it at the time of failure. Roy -