I have two questions 2001 ford Crown Vic LS, Codes read: (p0720 output speed sensor circuit), & (p1131 lack of heated oxygen sensor bank 1 sensor 1 switch indicates lean)........Keep in mined that I just swapped engines, from a 2001 police interceptor, to this Crown Vic LS "it's my first time, I am manically inclined but just never did a job this intensive, the LS engine blew so I had a totaled interceptor with good engine,... so hints the swap.... Can You Help with any answers on the codes??

bank 1 sensor 1 lean code. Check vacuum lines first. Could be egr leak also. Most vacuum lines run on the back side of the engine on these. Most common fail is the PCV 90 degree elbow. On the passenger side.

PO132 oxygen sensor high voltage bank 1 sensor 1
P1131 & P1132 lack of upstream heated oxygen sensor switch bank 1

Hope this helps you or future parties of intrest. P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1 P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2 I would get under your stang and gently clean outside portion of o2 sensors using a scotch brite. Also if you have so dielectric grease pull electrical connections to o2 sensors clean them and add grease. These trick eliminated the o2 sensor OBD1 codes on my 1987 Ford mustang gt

P0442 FORD - Evaporative Emission System Leak Detected Small Leak

Possible causes- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
P0136 - O2 Sensor Circuit Malfunction Bank 1 Sensor 2
Possible causes- Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
- Faulty Rear Heated Oxygen Sensor Bank 1
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

P0141 FORD - O2 Heater Circuit Bank 1 Sensor 2

Possible causes- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit fuse
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit open shorted to ground
- Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2 circuit poor electrical connection
- Faulty Engine Control Module (ECM)

P 1131 Oxygen sensor bank 1 sensor 1 lack of switching, You can have a vauum leak causing this sensor to read lean or the sensor went out and doesnt switch

P1131 is "Lack of H02S-1,1 Switch, Sensor indicates lean" I'd say you've got a bad Heated Oxygen Sensor at Bank 1, Sensor 1.

P1131 FORD - Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank 1
This code is usually caused by a defective Oxygen sensor in cylinder bank one of your engine. Cylinder bank 1 is the bank of cylinders that contains number 1 engine cylinder.

P0743 Torque Converter Clutch Circuit Electrical
P0750 Shift Solenoid A
P0755 Shift Solenoid B
P0760 Shift Solenoid C
P0442 Evaporative Emission System Leak Detected (small leak)
P0133 O2 Sensor Circuit Slow Response - Bank 1 Sensor 1
P1131 Lack of Upstream Heated Oxygen Sensor Switch -Sensor Indicates Lean -Bank 1

The transmission has a problem with shifting, and the evaporative emission system has a small leak, the O2 sensor has a problem on Bank 1 Sensor 1 either in the sensor or wiring.

P1132- Lack of heated oxygen sensor bank 1 switches - Sensor indicates rich
P1131- Lack of heated oxygen sensor bank 1 switches - Sensor indicates lean
P0135- Sensor heated circuit bank 1 sensor 1

Sounds to me like you need an oxygen sensor. I hope this helped and good luck.

P1131 Lack Of Upstream Heated Oxygen Sensor (HO 2 S 11) Switch, Sensor Indicates Lean (Bank #1)
P1132 Lack Of Upstream Heated Oxygen Sensor (HO 2 S 11) Switch, Sensor Indicates Rich (Bank#1)

Check connector and wiring on your sensor. Upstream bank 1 sensor is on passenger side at the bottom of the exhaust manifold. If it looks good, the sensor may have failed internally.