Just thought I would ask if anyone could help me out on this. I have taken my car in 3 times since April with my check engine light on. The codes I listed are what has come up. Today I took it in again, and only P0125 came on, but it has come one twice now along with the P1381 code. My car is lugging every once in a while and jerked real hard today. Any suggestions on what this could be? I will read the other responses on the P1131 code. I don't know anything about cars, and right now, don't trust it to drive too far. ANy advice would be helpful Thanks!

Thread on the P1381 code (http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=trouble&Number=282340&Forum=trouble&Words=p1381&Match=Entire%20Phrase&Searchpage=0&Limit=25&Old=1year&Main=282340&Search=true#Post282340)

P0125 Insufficient Coolant Temperature For Closed Loop Fuel

P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1.

The sensor is monitered for switching, it fails to switch when circuit or fuel excedes a calibrated limit.

Here the possible causes

- short to VPWR is harness
- Water in harness
- short/open circuit
- corrison or bad wiring
- damaged O2 sensor
- damaged PCM
- excessive fuel pressure
- leaking injectors
- leaking fuel pressure regulator
- car is almost out of fuel
- air leaks after MAF
- vacuum leak
- PCV system
- engine oil dipstick not seated
- EGR valve gasket leaking
- stuck EGR valve
- leaking diaphram or EVR
- oil overfilled
- cam timing is off
- cylinder compression
- exhaust leak near the O2 sensor

By looking at the causes for the P1131 code, Id say your P1381 cel could be the culprit for this.