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Qaagi - Book of Why

Causes

Effects

Both conditionscan causecode P0032

Bad MAF Sensor A bad mass air flow sensorcan causethe P0171 code

by plugs(passive) can be causedcode misfires

the mass air flow MAF sensorcausingthe code P0171

A contaminated air flow sensorcan also causethe code P0171

A vacuum leak herecan causea P0171 code

so badcauseda p0171 code

the PCMwill setcode P0069

by a bad or dirty mass airflow sensor or vacuum leaks(passive) is ... causedthe code p0171

a dirty or bad mass airflow sensor or vacuum leaks(passive) can be caused byThe code P0171

a leakcausingthe P0171 code

an O2 sensoris causingthe P0171 code

the fuel system running too lean(passive) is caused byCode P0171

by the fuel system running too lean(passive) is causedCode P0171

by the fuel system running too lean(passive) is caused byCode P0171

enoughto causea P0171 code

by an intake leak(passive) is ... caused bythe P0171 code

also(passive) could ... be causedP0171 code

also(passive) could ... be causedThe P0171 code

aircausingP0171 code

a fuel filtercausea P0171 code

Typical factorswill setcode P0441

the PCMwill setcode P0420

Any cracks or leakswould potentially causea P0171 code

many things(passive) can be caused byA P0420 code

may be caused by one or more of the following(passive) could also be causedThe P0171 code

Several thingscan causea P0420 code

a common thingwill causethe P0171 code

both EGR codescan causethe P0171 code

An exhaust leakcan causea P0420 code

Low fuel pressure ... a common thingwill causethe P0171 code

a modified exhaust systemWould ... causea P0420 Code

An engine with low compressionmay causea code P0300

spark plugscausea p0420 code

A bad catwill usually seta p0420 code

may be caused by one or more of the following : debris on the MAF sensor causing an incorrect reading , improper oil level , low or high fuel pressure , or Engine Control(passive) could also be causedThe P0171 code

may be caused by one or more of the following debris on the MAF sensor causing an incorrect reading improper oil level low or high fuel pressure or(passive) could also be causedThe P0171 code

a bad sensor(passive) can be caused byAn EGR code

Bad spark plug or wirescan causep0300 code

This vacuum problemwould also causean EGR code

for a code to save $ 3.50 off feespromptedfor a code to save $ 3.50 off fees

FRED to crashcausesFRED to crash

Ternary opvs withmay be setTernary opvs with

can cause excessive internal engine ignition and pre - ignition damage to the pistons and valvescan causecan cause excessive internal engine ignition and pre - ignition damage to the pistons and valves

sporadic oxygen sensor related codes to be set ... especially when the PCM can not execute fuel trim adjustments when the fuel pressure sensor feeds it invalid signalscould causesporadic oxygen sensor related codes to be set ... especially when the PCM can not execute fuel trim adjustments when the fuel pressure sensor feeds it invalid signals

when the voltage signal to the PCM from the Intake Air Temperature Sensor Circuit is erraticsetswhen the voltage signal to the PCM from the Intake Air Temperature Sensor Circuit is erratic

the transmission to unexpectedly shift to neutralmay causethe transmission to unexpectedly shift to neutral

to exacting specifications of a Philips 6CA7Designedto exacting specifications of a Philips 6CA7

in 212 bottlesresultedin 212 bottles

the wrench light to come on for 2017causingthe wrench light to come on for 2017

to other problemsleadsto other problems

in the systemsetin the system

the Check Engine Light to go on and this alone will cause a failed emission testcausesthe Check Engine Light to go on and this alone will cause a failed emission test

All of this resulting in(passive) being setAll of this resulting in

a no startwill causea no start

limp modecan ... causelimp mode

under certain freezing conditionsmay setunder certain freezing conditions

autos postcausesautos post

in the Powertrain Computeris setin the Powertrain Computer

what is the problemresultswhat is the problem

off the check engine lightto setoff the check engine light

misfirecausingmisfire

when the idle speed is persistently above a pre - determined RPM level for a specified amount of timesetswhen the idle speed is persistently above a pre - determined RPM level for a specified amount of time

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Smart Reasoning:

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