Skip the auto shop - Our mechanics make house calls

Q: codes p0101 and p0303 simultaneously

asked by on

I continue to get codes p0101 and p0303 when throttle is near wide open on highway on ramp (60-70mph). The fuel pump, filter, plugs, wires, cap, rotor, injector spider, and delco ecm have just been replaced in an attempt to correct this condition. The engine runs smooth until this speed, when you can feel a shudder and the check engine light illuminates. Cylinder 3 has 185 psi compression check, and continuity was checked on ecm etc.

My car has 240000 miles.
My car has an automatic transmission.

A: The code P0101 is for a problem with the MA...

The code P0101 is for a problem with the MAF sensor and code P0303 is for a cylinder number 3 misfire. The first thing to check is to make sure there is no vacuum leaks or leaks between the MAF and the throttle body connection hoses. The MAF may be giving an incorrect input to the computer causing the misfire and MAF code. Have the MAF code pinpoint test done and replace the MAF if it fails the test.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Why do I keep getting a P0101 code in my 2011 Nissan Sentra

Hello. If you are continuing to get the same code then the engine needs to be checked first for any vacuum leaks. The slightest leak in the intake tubes or any of the vacuum hoses or gaskets will cause this....

Q: Vehicles starts but dies

There may be a couple of different things that could cause the start then stall. The fuel pump and filter are the most common cause of a stall, or no start, but the mass air flow sensor can also cause...

Q: Can't get power at all. Misfire with code P0303.

Hi there. The code P0303 means that cylinder number 3 has a misfire. There are three ways that the cylinder number 3 can be misfiring. Spark plug is fouled out and not creating a strong enough spark to ignite...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.