Q: P2178 and P115D codes are showing up on a scanner. Could both be related to the MAF sensor?

asked by on November 29, 2016

Could both be related to the MAF sensor? Runs rough for about 30 seconds after start when cold then smooths out and runs fine. Recent head job, and timing chain, guides and tensioner work done but was doing this before hand. The HPFP is about a year old and I was pretty careful with the connectors and vacuum connections. It is a heavily modified engine. Just about every bolt on upgrade you can imagine and Manic stage 2 tune.

My car has 153000 miles.
My car has a manual transmission.

Hi there. The code P115D is for the mass air flow sensor (MAF). It says that the sensor has an offset signal. The code P2178 says that bank 1 is too rich. This means that the engine is running too rich (has too much fuel or not enough spark). Check the spark plugs to see if they are working and if they are soaked in fuel. Also, check the fuel pressure regulator to see that its functioning. I recommend performing a fuel injection flush first to make sure that there is no contaminants in the fuel rail. Also, I recommend replacing the MAF sensor for its not sending a correct signal to the computer, as if it has a broken connector or a short. If you need further assistance with the codes that you are getting on the code reader, then seek out a professional, such as one from Your Mechanic, to help you.

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

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

Coolant leak visible from driver side of engine.

Hi there. The leak that you are seeing could be from a coolant hose that is either loose or split. Also the coolant leak could be coming from a core plug (freeze plug). The best way to track a leak...

Side of my car is touching the ground

Nissan just issued a recall NHTSA Campaign #15V573000 dated 9/17/2015 that the dealer will replace the two front coil springs. You should have or will receive the recall from Nissan. You should contact your dealer and schedule the repairs as...

Looking for a car that is good in winter

Hello. If you’re going to buy a Sante Fe that offers all wheel drive or four wheel drive, it should hold up pretty well in the harsh winter weather conditions. A Sante Fe with front wheel or four wheel drive...

Related articles

What Sensors Do All Cars Have? And What Optional Ones Are There?
Modern cars have an increasing amount of sensors. Most cars have an oxygen sensor and a throttle position sensor, but parking sensors are optional.
What Happens to Sensors if They are Dirty?
Car sensors can get dirty with normal use. Symptoms of dirty sensors include reduced engine power, worse gas mileage, or an engine that hesitates.
How Do Sensors Get Dirty or Damaged?
Car sensors measure and relay vital information to the ECU. Some sensors can get dirty from normal use, or fail if the car overheats or has a problem.