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How to figure out how to fix a p0442 code and p0171 code the engine also has ruff idel and codes popped up at that time

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Here are some links to information about your vehicle problems as well as possible solutions
p0442
p0171

Posted on May 18, 2011

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Posted on Jan 02, 2017

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WHAT CAN I DO TO FIX MY AUTO HAVE CODES P0171 P0174 01000 P2195 P2197 WHAT ARE THE CODES.


P0171 & P0174 are lean codes.this can be cause by a vacuum leak. One of the symptoms is a ruff idle when cold.

You can listen for it or you can have it smoke checked by a shop. Most common causes are intake plenum gaskets and rotted PVC hoses.

Feb 18, 2015 | 2004 Lincoln LS

1 Answer

4 Codes in computer


code p0128 indicates a mechanical fault ( could be the thermostat stuck open)
code p0174 -system too lean -bank2 ===causes --intake /exhaust leak--fuel pressure/pump--injectors--AIR system--hose connection/s
code po171 refers to system too lean bank 1 same as po174 with the HO2S sensor being the culprit. As to all being related . only by way of the o2 sensors
code p0442 is not connected to the first 3 as it is in a different section of the fuel system

Apr 09, 2014 | 2003 Saturn VUE

1 Answer

P0068, P0171, and P0446 and new ones down below


-I hate to say that but absolutely NO. If you don't know much about car. All these codes are emission code.
P0068 Mean Throttle position sensor.
P0171 Mean system too lean.
P0446 Mean evaporator emission control system has not correct flow
P0507 Mean Idle air control is too hight.
P0116 Mean engine coolant temperature.

Need to have a mechanic to check one by one to determine which part is effect before replace it.

Good luck

Mai Lor

Mar 25, 2014 | 2006 Kia Rio

2 Answers

1990 BMW 525i stalling, ruff idel.


Your fuel injectors maybe clogged up,have them cleaned.

Apr 25, 2017 | Cars & Trucks

1 Answer

PO174 P0171 CODES 2004 CADILLAC DEVILLE


The code P0171 and P0174 have the same mean that "System Too Lean"
OBD2 code scanner

Jul 19, 2012 | 2004 Cadillac Deville

1 Answer

What does engine code po171 on a 2007 chrysler pacifica mean


A P0305 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. Did the codes appear after the new plugs/wires were installed? What about new Dist. cap and rotor?

Did you use quality parts?

Check for vacuum leaks (including manifold gaskets) on Bank 1 (Driver's side).

Also swap Cyl.#5 injector with another cylinder and see if the misfire code changes.

Are you sure #5 plug is firing?It's possible the cat may be restricted, but I would first swap #5 injector with another cylinder and check for vacuum leaks.

A plugged cat/exhaust system will not set a P0171.I'd say first check the intake manifold gaskets (two of them) for leaks. There are other things that could be causing those common but pesky p0171 and p0174 codes. I would recommend you search the forums on those two codes as they're pretty common.

The P0442 code is likely not related

Feb 15, 2012 | Cars & Trucks

2 Answers

I have a 98 Ford Contour and these codes. - P0708, P0171, P0442


p0708 is transmission range sensor curcuit high output, p0171 is system to lean ( bank 1 ), p0442 is EVAP emission control leak ( small ).

Mar 20, 2011 | Ford Contour Cars & Trucks

1 Answer

1998 Malibu 3.1L V6, Check Engine code P0171, Both O2 Sensors replaced, ruff idle in park, ruff idle in drive and comes to stop but smooths out, WHAT DO YOU THINK (EGR Valve?)


P0171 - is fuel system is to lean (Bank#1) Take the car back to who ever scanned it for you and see if any codes are now pressent in particular to the EGR Valve they range from P0400 up to and including P0409, or any other new codes.While you are at it make sure they erase the set code P0171 un less it is already don.If no codes show up on the new scan replace the Ignition Control Module not the ( ECM -on board computor).If new codes do show up follow up on them first. Good Luck.

Dec 08, 2010 | 1998 Chevrolet Malibu

1 Answer

My cadillac deville has the following engine codes when hooed up: P0106, P0121, P0171, P0174, P0335, P0340, P0385, P0442, P0506, P0506, P0507, P0601.


click on the below links for code details.
P0106

P0121

P0171

P0174


P0335


P0340

P0385

P0442

P0506

P0507

P0601.

all of the above codes seem to have a common cause, they all list a bad ecm (computer) as being a cause, and the last code P0601 points specifically to a bad computer. sorry for the bad news, hope this helps.

Dec 06, 2009 | 2000 Cadillac DeVille

1 Answer

Engine Light on got 3 codes


Fix the leak at the emissions system first. There is a small leak that the PCU detected. That could be the cause of the P0116 problem. Also the PCU detected a lean gas mixture because it is getting more air to the fuel system than gasoline. Start with the leak , then the Engine temperature sensor. I think that fixing the lek will "fix' the othe 2 problems. but it could be either one or all of them.

Feb 06, 2009 | 2000 Kia Sportage

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