1 - The O2 sensor doesn't come "online" until after the engine starts.
2 - For the 113, try removing and cleaning each of the two grounding wires on the fuel rail brackets. I think the front one is for the ECU, but do them both).
The 113 code is detected by ECU sampling the current in the common Injector ground, which finally terminates at one of those two ground points . The problem may be either too little or too much current. Some possible causes are:
a) Too little current — A break (open circuit) on the ground side, or a varying (poor) ground connection. Or a +12V supply failure on the common positive side (supplied by the fuel relay*)—causing the ECU to see nothing on the ground side.
b) Too much current — Could be a short circuit to ground on any injector, or between their common point and the ECU. This fault is less likely, IMO.
* Try connecting the LEFT side of fuse #4 to the LEFT side of any fuse 6 thru 10 (+12V source).
The pumps will run immediately so try starting.
The jumper bypasses the 25 Amp fuse and the Fuel relay—both are known no-start suspects.
Post back after you've cleaned the grounds and tried the fuse jumper.
P.S. Do you have spark at the plugs while cranking?
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Bruce Young '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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