Skip the auto shop - Our mechanics make house calls

Q: P0174, P1004 codes

asked by on

Started out with a very strong exhaust smell that lingured inside even with the windows rolled up even on the highway well then the car start losing acceleration and the CEL came on and now the car idles rough and still has acceleration problems at low speeds but seems to do better at high speeds Im getting codes p0174 and p1004

My car has 10000 miles.
My car has an automatic transmission.

A: From what you describe it would appear th...

Hello.

From what you describe it would appear that your vehicle is experiencing some sort of fuel or engine performance issues. Code P0174 is for an lean condition in engine bank 2. This can be caused by many things, however a few common causes are a bad fuel pump, a fuel injector issue. Code P1004 is for an issue with the short runner control valve assembly. This is a component installed in the intake manifold that controls the opening and closing of butterfly valves in the intake runners that are meant to increase low RPM performance. This code is set off when the computer detects an issue with the signal, perhaps due to a faulty unit. The two codes address different issues, but it may be possible that the two are related. As engine performance issues can sometimes be difficult to diagnose, I would recommend having a certified technician, like one from YourMechanic, perform a professional diagnosis of your trouble codes if you are unsure of the issue.

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

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: Loud noise from 2nd gear up

What you are describing is a noise that a wheel bearing makes when it is worn out. They usually last about 100,000 miles. This part will not affect acceleration or engine temperature. They do however will change pitch, get louder,...

Q: Crank but not start, There is spark and fuel spray in injector, I change the PCM and distributor box but still the same no start

If you are getting spark and fuel to the engine then the only thing left to check is the compression in the engine. Have a compression test done to see if the timing belt may have jumped timing. You should...

Q: BMW 35I check engine light on after using siphon

I wouldn't use a siphon again. I've got a video about it and then I said don't use it, because I've seen it cause problems. What you want to do is wait when you are almost out of gas, fill...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...