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Condenser & Radiator could be very dirty on the outside, as well as have leaves,feathers,etc between them The radiator may just need to be replaced, as it is old & clogged inside The thermostat may need replacing Exhaust Converter is surely worn out & partially blocked, as they only last 12 to 14 years Spark Plugs,if in there over 3 years,check for cylinder misfires & fuel trim data A/C System Overcharged or Air in there, from trying to add to a leaking system
This code means that system to lean, bank 1. some of the possible causes to make this code set are 1. intake or exhaust leak, 2. problem with the air system. 3. MAF (Mass Air Flow sensor)VAF sensor (Volume air flow sensor) 4. fuel pressure/pump 5. injector(s) 6. HO2S (Oxygen sensor)
I had a similiar problem on my 1999 Dodge Ram 1500 Conversion Van. It ended up being a partial collapse of the catalytic converter which didn't allow adequate exhaust. The problem only showed itself because I could not get over 55 mph going up a small hill.