The downstream Oxygen sensor ( the one on the exhaust side of the catalitic converter) has an electrical problem. code 136 means its not getting the correct signal. This could mean the Cat is plugged BUT the next code 141 says there is a short to ground or open to the Oxygen sensor heater(there is a little heater in the O2 sensor).
So - visually inspect the wiring to and from the Oxygen sensor and all electrical plug(s) connected to the O2 sensor. If there is a crushed wire, the wire it must be replaced. Clean the electrical plug(s)
Then I said if this does not provide a solution, then replace the O2 sensor
304 was the last code. The Ford book asks if you have recently run out of gas. YES/NO? The book explains that running out of gas may cause this code to appear. The first thing to do is remove the negative cable from the car battery. Leave it disconnected for 15-20 minutes. This will cause the memory in the Powertrain Control Module (PCM is the 'brain' of the car) to clear. After 20 min. reconnect the negative battery cable. Now we get into what to do to reset the PCM. The book says start the car with all accecories turned off. Allow the car to reach normal operating temperature. Go for a 10 mile gentle city type drive. If the car origanally ran out of fuel. the code 304 should not return.
This is a list of systems in the car that may cause a 304
-- Ignition System.
-- Fuel Injectors.
-- Fuel Pressure.
-- Evaporative Emission System.
-- EVAP Canister Purge Valve.
-- Base Engine.
-- Running out of fuel.
I started with the last one because the solution is easy to do.
And 'Best of Luck' meant that I had spent the last 4 MONTHS chasing a problem, now solved.
