Q: Codes p0456 and p0102. White-blueish smoke coming from exhaust no overheating and loss of power. Obviously not running right.

The smoke could be burning oil. If the smoke occurs just at start up, the source could be leaking valve stem oil seals. If the smoke continues but is mainly white, that could signify an internal coolant leak. P0456 refers to a leak in the EVAP system. If a leak exists, it would usually be revealed by a smoke machine test. P0102 will set if the ECM is detecting a voltage output from the MAF sensor that is lower than normal or required by the ECU to function properly. Check for MAF wiring too close to higher voltage consumption components, especially alternators, ignition wires, etc. which can give false readings. Also, check for restrictions in airflow from the air cleaner to the MAF sensor such as a clogged air filter. The codes can be resolved if you request a check engine light diagnostic. Unless the smoke is due to an engine management or tuning issue, and perhaps resolved once the fault(s) behind the codes is pinpointed, the cause of smoking will otherwise be internal (seals or mechanical). The mechanic who performs the check engine light diagnostic will be in a position to evaluate the origin of the smoke. If you have further questions or concerns, do not hesitate to re-contact YourMechanic because we want you to make the most of your repair dollars and help you to get the best possible results.