Q: Problem was misfire cylinder 5 - replaced plugs, wires, ignition coil, MAF, PCV, now I have code P0174 indicating vacuum leak.

asked by on

Original problem was "misfire cylinder 5." Replaced plugs, wires and ignition coil. Next P0148 - replaced MAF. Then got codes P0174 and P0171. Replaced PCV. Now the P0174 remains - Fuel System Too Lean (Cylinder Bank 2). What is the next step?

My car has 108500 miles.
My car has an automatic transmission.

P0174 can set if: there is an air leak after the mass air flow (MAF) sensor, such as a torn intake boot, or bad intake manifold gaskets; a dirty or faulty mass air flow sensor; a faulty oxygen sensor, incorrect fuel pressure, a leaking positive crankcase ventilation (PCV) valve, a clogged exhaust gas recirculation (EGR) port, and/or a leaking brake booster. To have these possibilities ruled in or out, the recommended service is a check engine light diagnostic - Code P0174. If you request that service, the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here 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
  1. Home
  2. Questions
  3. Problem was misfire cylinder 5 - replaced plugs, wires, ignition coil, MAF, PCV, now I have code P0174 indicating vacuum leak.

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: 3.0 l honda interference or non

Yes this engine is an interference motor and the likelihood of bending valves if goes out of time on the camshafts.

Q: Q: Fuel pump

Make sure the fuel gauge is actually accurate. Maybe "half a tank" is "empty"? It is relatively easy to rule out the fuel pump by testing the pressure on the fuel rail but that will not tell you anything about...

Q: Can not get anti theft to turn off on my car

The first thing to do is remove the installed lock to see if the lock is seized or the latch is broken and needs replaced. If after the lock and latch is fixed then recheck the theft system to see...

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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...