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I guess your car is a 850 GLE?
How old is your O2 sensor?
This code is common with a bad O2 sensor.
Mike
Here's some troubleshooting out of the service manual....
1-1-3 (HO2S Integrator At Maximum Enrichment Limit)
1) Code 1-1-3 means that engine is running lean.
This may be caused by an air leak or an HO2S sensor fault.
2) Connect measuring unit to fuel injection ECU. See
MEASURING UNIT under SELF-DIAGNOSTIC SYSTEM. To check HO2S sensor
signal, start engine. Connect voltmeter between measuring unit
terminals No. 22 and 23. Voltage should vary between .1-.9 volt after
about 30 seconds.
3) If voltmeter indicates a constant one or zero volts, HO2S
sensor is interpreting lean air/fuel ratio or is shorted to ground.
Disconnect HO2S sensor connector at firewall. Use a voltmeter and
backprobe between connector terminal No. 2 and ground. See Fig. 4.
4) If voltage remains constant at zero or one volt, check
engine CO adjustment. If voltage varies between .1-.9 volt and code is
still present, HO2S control is adjusting CO correctly but fuel
injection ECU is indicating fault. Check engine CO.
5) To check CO, connect CO meter to CO tap in exhaust pipe.
Start and run engine to operating temperature. Disconnect HO2S
connector. Display, record, then erase codes. Check CO.
6) If meter indicates low CO and engine operates very
unevenly, engine is running lean. If meter
indicates high CO (greater than 2.5 percent), engine is running rich
and system must make mixture leaner to compensate for fuel leakage or
other fault.
7) If CO content is .3-2.5 percent and engine runs normally,
reconnect HO2S sensor and recheck CO content. If reading becomes too
high or low, repeat test using new HO2S sensor. If CO content is still
incorrect, repeat test using new fuel injection ECU.
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