My car keeps flashing a code 44 after about 10 minutes of driving. It does it in all conditions, so I have a constant problem. I'm running too lean. What could cause this? Obviously a bad 02 sensor, but has anyone else encountered this problem and changed something else to fix it?

 

I dont know. Did you check the owners manual? That usually helps.

 

O2 sensor, left bank is running lean.

 

When I had a code 44 it ended up being the ecm.

One way to tell, is to pull the o2 sensor. If there's a black carbon build up on the o2 sensor the car is running rich.

Thus, the ecm has failed. The ecm thinks the car is lean so, it keeps pumping more gas in to the engine, creating the extra carbon on the o2 sensor.

hope this helps

By the way, it takes 10 mins, to show the code because the car doesn't go into closed loop untill it gets warmed up.

 

There are numerous reasons for a '44' to be present. The most obvious is the O² sensor getting old and weak (typical failure mode). If the sensor is good, there are still plenty of things to go wrong that will cause the code.

Exhaust manifold leakage, AIR diverter valve or distribution tube problems, low fuel pressure, vacuum leaks (just about anywhere), poor electical connections at the O² sensor and/or ECM, failing ECM (poor bias voltage), clogging injectors, incorrect PROM/MEMCAL, and a host of others.

You can search the archives for "code 44" and find about eleventy-jillion threads. You are not alone.