Engine code 41 relates to the signel from the cam position sensor. A signal has not been detected in the last 2 seconds while the engine was running. This could be a wiring problem, a problem with the sensor, or the magnet.
Engine code 44 relates to a system lean condition. The ECM is not seeing the O2 sensor voltage get above 0.35 volts DC. It could be a defective O2 sensor, a wiring problem, low fuel pressure, clogged injector(s), exhaust system leak, etc.
If you have access to Alldata at your local library look up your car and print off the pages for these codes. The trouble shooting tree and diagnostic aids make good reading.
Hope this helps.