Code 13. Oxy sensor problem...
 

My friend just purchaised '91 Fierbird 3.1, MT5.

As usually we replaced TCP, MAP, EGR and Oxy Sensor.

But engine runs riught, code 13 (Oxy sensor reads lean at crusing speed), so the quation is why this code appeares with new oxy sensor. What to check.

BTW. Someone, please help me to get engine controll wiering diagrams and sensor parameters.

Thanks!