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I have a very strong exhaust smell and wondered what it could be. I swapped a motor out that was leaking coolant through. I have had to replace all the o2 sensors since but have not replaced the 2 downstream yet. Are my cats fried?
Are you leaking any oil? I had an exhaust smell and it was my front crank seal leaking and blowing back oil onto my headers and exhaust pipes and I had the same smell. I used blue devil recently and will post my results.
So if the downstream o2 sensors are bad ill get a strong smell from the exhaust? How does that work? I plan on swapping both out but have to wait for that extra cash right now.
If you would have given us the fault code numbers it would have helped but if the 02's are bad you will either run too rich or leaning, hence the smell.