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Code 136 is for a problem with the O2 sensor bank one sensor two.
That is the sensor after the catalytic converter.
The sensor or the wiring would need to be checked.
If the check engine light is flashing you should probably get it scanned to see which coil(S) need replacing. When the light flashes it means that something is seriously wrong. STOP driving. If you continue to drive it will melt your catalytic converters. I have had customers that get the misfire issues repaired and come back maybe a month or two later with burnt converters. Converters are not cheap either.
When you say manifold, I assume you mean the exhaust manifold. If its the one you can see (there is an exhaust manifold on the back of the engine also for the rear 3 cylinders) its a clogged or fried catalytic converter. There are a couple of catalytic converter cleaners on the market you can try, but most likely it will need to be replaced. Was there another problem recently i.e. bad coil pack etc?
if it's a four cylinder motor it only has one bank of cylinders, sensor one is going to be the one before the catalytic converter, should be visible under the hood. if it is a V6 then bank one is going to be the one closest to the very front of the vehicle, again sensor one is going to be the one BEFORE the catalytic converter.
Ford Escape and Mazda Tribute same engine same problem check out Catalytic Converter problems on both in the long run will have to replace all 3 of the converters may blow a hole in the EGR valve too. Go for after market parts will save you money and not going thru a dealership will help but expect to pay close tto $1,800 mostly due to labor to replace these parts. If you have a check engine light try going to Auto parts store and use their computer to check out code. Not getting this fixed will leave you stranded when it goes. Vehicle will suddenly bogg down and trust me when your doing 60 mph on the hwy. and suddenly this happens to you not a good feeling. Hope this helps.-->
Ford Escape and Mazda Tribute same engine same problem check out Catalytic Converter problems on both in the long run will have to replace all 3 of the converters may blow a hole in the EGR valve too. Go for after market parts will save you money and not going thru a dealership will help but expect to pay close tto $1,800 mostly due to labor to replace these parts. If you have a check engine light try going to Auto parts store and use their computer to check out code. Not getting this fixed will leave you stranded when it goes. Vehicle will suddenly bogg down and trust me when your doing 60 mph on the hwy. and suddenly this happens to you not a good feeling. Hope this helps.
That would be my diagnosis as well. Have someone follow you while you're driving it. Many times a vehicle with a failing cat. converter will smell like sulfer or rotten eggs to someone driving behind them.
cseibolt
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