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Old 08-20-2005, 02:41 AM   #1
focusin
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Check engine light codes & meanings

This is for those of us with a Flasher with CEL reading options or OBD-II Scanners.

PO102---- Mass airflow (MAF) Sensor circuit low input

PO103---- Mass airflow (MAF) Sensor circuit high input

PO106---- Barometric pressure sensor circuit performance

PO107---- Barometric pressure sensor circuit low voltage

PO108---- Barometric pressure sensor circuit high voltage

PO109---- Barometric pressure sensor circuit intermittent

PO112---- Intake air tempature (AIT) sensor circuit low input

PO113---- Intake air tempature (AIT) sensor circuit high input

PO117---- Electronic coolant tempature (ECT) sensor circuit low input

PO118---- Electronic coolant tempature (ECT) sensor circuit high input

PO121---- In range Throttle posistion sensor (TPS) fault

PO122---- In range Throttle posistion sensor (TPS) circuit low input

PO123---- In range Throttle posistion sensor (TPS) circuit high input

PO125---- Insufficiant Coolant Tempature

PO127---- Intake air tempature sensor "A" circuit

PO131---- Upstream heated O2 sensor low voltage (Bank 1)

PO133---- Upstream heated O2 sensor circuit slow response (Bank 1)

PO135---- Upstream heated O2 sensor heater circuit fault (Bank 1)

PO136---- Downstream heated O2 sensor fault (Bank 1)

PO141---- Downstream heated O2 sensor heater circuit fault (Bank 1)

PO151---- Upstream heated O2 sensor low voltage (Bank 2)

PO153---- Upstream heated O2 sensor slow response (Bank 2)

PO155---- Upstream heated O2 sensor heater circuit fault (Bank 2)

PO156---- Downstream heated O2 sensor fault (Bank 2)

PO161---- Downstream heated O2 sensor heater circuit fault (Bank 2)

PO171---- System adaptive fuel too lean (Bank 1)

PO172---- System adaptive fuel too rich (Bank 1)

PO174---- System adaptive fuel too lean (Bank 2)

PO175---- System adaptive fuel too rich (Bank 2)

PO176---- Flexable fuel sensor "A" circuit

PO181---- Enginefuel tempature sensor "A" circuit range

PO182---- Enginefuel tempature sensor "A" circuit low input

PO183---- Engine fuel tempature sensor "A" circuit high input

PO186---- Engine fuel tempature sensor "B" circuit range

PO187---- Engine fuel tempature sensor "B" circuit low input

PO188---- Engine fuel tempature sensor "B" circuit high input

PO190---- Fuel rail pressure sensor circuit performance

PO191---- Injector pressure sensor system performance

PO192---- Injector pressure sensor low input

PO193---- Injector pressure sensor high input

PO300---- Random misfire

PO301---- Cylinder #1 misfire detected

PO302---- Cylinder #2 misfire detected

PO303---- Cylinder #3 misfire detected

PO304---- Cylinder #4 misfire detected

PO320---- Ignition engine speed input circuit performance

PO325---- Knock sensor circuit fault

PO326---- Knock sensor circuit performance

PO330---- Knock sensor 2 circuit malfunction

PO331---- Knock sensor 2 range

PO340---- Camshaft position sensor circuit malfunction

PO350----Ignitioncoil primary/secondary circuit malfunction

PO351---- Ignitioncoil #1 primary circuit fault

PO352---- Ignitioncoil #2 primary circuit fault

PO353---- Ignitioncoil #3 primary circuit fault

PO354---- Ignitioncoil #4 primary circuit fault

PO400---- EGR flow vault

PO401---- EGR insufficient flow detected

PO402---- EGR excessive flow detected

PO411---- Secondary air injection system upstream flow

PO412---- Secondary air injection system circuit malfunction

PO420---- Catalyst system efficiency below threshold (Bank 1)

PO421---- Catalyst system efficiency below threshold (Bank 1)

PO430---- Catalyst system efficiency below threshold (Bank 2)

PO431---- Catalyst system efficiency below threshold (Bank 2)

PO442---- EVAP Small leak detected

PO443---- EVAP VMV circuit fault

PO451---- FTP sensor circuit noisy

PO452---- EVAP fuel tank pressure low input

PO453---- EVAP fuel tank pressure high input

PO455---- EVAP control system leak detected, very small leak

PO457---- EVAP control system leak detected, fuel filler cap loose/off

PO460---- Fuel level sensor circuit malfunction

PO500---- VSS Malfunction

PO501---- VSS range

PO502---- VSS intermittent

PO505---- IAC valve system fault

PO552---- Power steering sensor circuit malfunction

PO553---- Power steering sensor circuit malfunction

PO602---- Control module programing error

PO603---- PCM keep alive memory test error

PO605---- PCM read only memory test error

PO703---- Brake switch circuit input malfunction

PO720---- Out put shaft speed sensor, insufficient input


I hope this helps, it came straight from Haynes Repair manual which can be bought at any auto parts store.

Jon


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Last edited by focusin; 08-23-2005 at 06:19 PM.
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Old 10-04-2006, 03:26 AM   #2
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Here are a few more


P1131 - Lack of H02511 Switches Indicates Lean (See P2195)

P1246 - Alternator Load Input (See P0622)

P1270 - Engine RPM or Vehicle Speed Limiter Reached
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Old 10-04-2006, 04:56 AM   #3
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My wifes sisters car shows the code PO442---- EVAP Small leak detected
Now the problem is where is the leak coming from. Anyone have any ideas
where to start? I already replaced the gas cap with a new one,so its not that
from what I can tell. Any help here woould be great.
PS
I am new here, so be gentle with me Thanks for having forums like this
to try and help.
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Old 10-26-2006, 07:49 PM   #4
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CEL

Can anyone direct me where to find the plug in for the Check Engine Light module code reader? Thanks. Lomita
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Old 10-27-2006, 08:05 PM   #5
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Its underneath the dash and left of the hood release.
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Old 10-27-2006, 09:06 PM   #6
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Thanks Tom, will check it out tomorrow in the daylight. Also going to get a copy of the Haynes manual at Pepboys.
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Old 10-28-2006, 03:32 PM   #7
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Good news Tom, I found the receptacle. If it had been any closer it would have bit me. I can chock it up on wearing my midrange glasses instead of my bifocals. Anyways, found a hose hissing under the hood, $27 for the hose replacement from Ford, (EGR hose), plugged in the OBD II reader, it went through the process, blinked a couple of times, the fault codes cleared, and the check engine light extinguished. Mission accomplished. Thanks for the directions. Fred
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Old 10-28-2006, 04:43 PM   #8
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Nice, glad you've found it as well as the problem and thanks for the update.
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Old 10-28-2006, 05:14 PM   #9
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The P0420 has to do with your exhaust. Either you O2 sensor or Cat. The cat has a 100,000 mile warranty. Just thought you all might want to know.
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Old 11-16-2006, 02:31 PM   #10
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hey, you guys do know that the focus has it built into it right? Hold the odo button, start the car, continue to hold the button till u see ur needles go *WHHEEEEEZE* (go up and down) the second the move, let go. Using the odo button you can cycle through many modes. There will be a time when it will flash DTC then a number or NONE. Check that. This works with almost any ford that has a digital ODO PLease see the original post in the performance forum that reads "The tach you never new you had" Spelled just like that in the SPI performacne forum.
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