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

asked by on

Codes p0456 and p0102.check engine and trac off light came on. White-blueish smoke coming from exhaust pipe when starting. But no overheating and loss of power. Randomly started shaking amd vibrating and i pulled over and shut off. Started back up and it was fine. Had it took to dealer and got fixed. They told me it was the mass air flow needed replaced. Had it back for 3 days and the lights came back on. The same smoke coming from exhaust pipe. Obviously not running right. Had codes pulled again at an autozone and i got p0456 and p0102. Open circuit condition, short to ground, MAF/VAF sensor failure, and faulty ecm. Please help thanks!

My car has 81000 miles.

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.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Codes p0456 and p0102. White-blueish smoke coming from exhaust no overheating and loss of power. Obviously not running right.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: One of the rack and pinion boot is wet, but the power steering fluid container is to the normal level.

If the boot is getting wet but is not actively leaking or show drips then the leaks is considered only a residue leak and may not need to have any work needed. For the noise you did not mention the...

Q: How do I check the engine coolant level of a 2012 Nissan Altima?

Checking the coolant level is an important part of general maintenance and should be done roughly once per month or so. It’s not hard to do, and here are the steps to follow: Make sure the engine is cold....

Q: My girlfriends 2006 Toyota, 6 cyl, 4WD 4Runner's fuel gauge reads 1/4 tank when actually empty. What could be most likely cause?

Hello, and thank you for writing in. On most newer 4Runners, the fuel pump includes the fuel level as part of the unit commonly referred to as a fuel module. It is likely that the level is not calibrated, dirty,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.