Skip the auto shop - Our mechanics make house calls

Q: I have a p0174 code that was reviewed on a scanner.

asked by on

I have cleaned the MAF sensor twice, I have replaced all 4 02 sensors. I have checked for vacuum leaks by hazing the engine with brake cleaner. I am still getting a primary code p0174 and a second p0132 code on my OBD. Any advice would be greatly appreciated. Thank you

Hi there. The code P0132 in on for an issue with the upstream oxygen sensor. There could be a broken wire, frayed wire touching something metal, or the sensor could have failed. The code P0174 is on for the Mass Air Flow sensor (MAF). The MAF sensor could be dirty, has failed, or the intake plumbing could have leaks between the MAF sensor and the Barametric Pressure Sensor (BPS). Since you have cleaned the MAF sensor twice, then check the all of the clamps to the intake plumbing and make sure that there is no leaks. If there is no leaks and the clamps are tight, then I recommend replacing the MAF sensor.

If you have replace all of the oxygen sensors and the code is coming on for a failed or disconnected sensor, check the wiring to all 4 sensors and see if there is a frayed wire or a broken wire. All it takes is 1 broken wire to set the code.

If you need further assistance with your engine codes solutions, then seek out a professional, such as one from Your Mechanic, to help you.

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: Fuel leaking from my engine.

You must have a fuel line that is leaking. Diesel engines have very high fuel pressure. With the age of your vehicle it is very possible that you have a fuel line that has rusted through. This is a pretty...

Q: My truck is losing power on take off and throwing multiple codes

Hello. The codes listed are indicative of lean conditions on both banks A and B, as well as issues with the camshaft position sensor for circuit B. A lean condition at both banks can be caused by many things. A...

Q: I have a misfire from cylinder 1and 5. I replaced the coil pack and all 6 plugs and still have the misfire codes P0132 and P0135

Hello. Check the crankshaft position sensor and the distributor for slop in the distributor drive next, which can cause mistiming and misfire issues as well. A certified technician from YourMechanic can come to your car's location to diagnose the misfiring...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...