My 1991 240 wagon had a few codes, 113, 212, 232.
I changed my oxygen sensor last night and the code 212 came back after a block.
The wagon was sitting with a dead battery for a week before I swapped the sensor so I am sure it the codes were clear. I did the sensor swap while the battery was out of the wagon.
I came home cleared the code checked all the connections for the O2 at the firewall and took it for another drive and it still cam back on after a few minutes.
Can anyone help I need to get a smog cert before I can get her registered.
Oh I also changed the plugs and wires the cap and rotor look good.
Help!