Codes:KOEO 82, KOER 21, 33 & 41, can I get what they are?

EEC-IV Computer Codes2 Digit Codes:

(O) = Key On Engine Off test
(R) = Key On Engine Running test
(M) = Memory code

Note: Some codes may only be for certain model cars. So if you see something about 1.9L cars disregard it.

11 System checks OK -

12 Idle Speed Control motor or Air Bypass not controlling idle properly (generally idle too low) -

13 (O) ISC did not respond properly (extends to touch throttle then retracts for KOEO) -
(R) Idle Speed Control motor or Air Bypass not controlling idle properly (generally idle too high)
(M) ISC sticking, open ITS circuit or TP sticking

14 Ignition pickup was erratic -

15 (O) No Keep Alive Memory power to PCM pin 1 or bad PCM (Memory Test Failure)
(M) KAM (pin 1) was interrupted (was battery disconnected ?)

16 1.9L & 2.5L - Throttle stop set too high -
2.3L - RPM's too low - IDLE
(O) Electronic ignition - IDM circuit fault -

17 1.9L & 2.5L - Throttle stop set too low -


18 (R) Check base timing & advance function -
(M) Ignition TACH signal erratic -

19 (O) No Vehicle Power (pins 37 + 57) or bad PCM VPWR Diagnosis
(R) Erratic idle during test (reset throttle & retest) - Idle Set Procedures
Electronic ignition Cylinder ID sensor/circuit problem - Ignition Systems

21 Engine Coolant Temperature (ECT) sensor out of range -

22 MAP (vacuum) or BARO signal out of range -

23 Throttle sensor out of range or throttle set too high -

24 Intake Air Temperature (IAT) or Vane Air Temperature (VAT) sensor out of range -

25 Knock sensor not tested (ignore if not pinging) -

26 Mass Air Flow (MAF) or Vane Air Flow (VAF) out of range -
Transmission Oil Temperature (TOT) sensor out of range - Transmissions

27 Vehicle Speed Sensor problem -

28 Vane Air Temperature (VAT) sensor out of range -
2.3L w/Electronic Ignition - Cyl ID, IDM low or right coil pack failure - Ignition Systems

29 Vehicle Speed Sensor problem -

EGR CODES DEPEND ON WHAT SYSTEM TYPE THE VEHICLE IS EQUIPPED WITH:


EVP is for vehicles equipped with EGR solenoid(s), with or without an EVP sensor

EVR is for vehicles equipped with an EGR Vacuum Regulator (EVR) and an EGR Valve Position (EVP) sensor

PFE is for vehicles with Pressure Feedback EGR (PFE) sensor and and an EGR Vacuum Regulator (EVR)

If you don't know what type of system you have, go to the EVP heading, which is the first one.
There are pictures under the different headings to help you identify the system.

31 EVP - (O, R, M) EVP signal is/was out of range -
EVR - (O, R, M) EVP signal is/was low -
PFE - (O, R, M) PFE signal is/was low -

32 EVP - (R) EGR not responding properly during test -
EVR - (O, R, M) EVP signal is/was low -
PFE - (R, M) PFE shows low pressure, EGR not seating or memory, not seating intermittently -

33 ALL - (O, M) EGR did not open/ respond during test or if memory code, did not open intermittently -

34 EVP - (R) EGR did not respond properly during test -
EVR - (O, R, M) EVP sensor is/was high -
PFE - (O, R, M) PFE sensor is/was out of range -

35 EVP - (R) Engine RPM's too low to test EGR system -
EVR - (O, R, M) EVP sensor signal is/was high -
PFE - (O, R, M) PFE sensor signal is/was high -

38 Idle Tracking Switch signal was intermittent -

39 Transmission Torque Converter clutch not engaging -

40 SERIES FUEL/AIR INJECTION CODES ON VEHICLES WITH DUAL OXYGEN SENSORS REFER TO THE RIGHT OR REAR SENSOR. EXCEPT: 1984-1988 3.8L ENGINES: LEFT SENSOR

41 (R) System lean -
(M) System was lean for 15 seconds or more (no HO2S switching) -

42 (R) System rich - Fuel control
(M) System was rich for 15 seconds or more (no HO2S switching) -

43 (R) HO2S sensor not reading (run at 2000 rpm's for 2 minutes and retest - check for HO2S switching)
(M) Was lean at WOT for 3 seconds or more -

44 AIR system inoperative -

45 AIR not Diverting (AIRD) - Air Injection
Electronic Ignition - coil primary circuit failure -

46 AIR Bypass (AIRB) not working - Air Injection
Electronic Ignition - primary circuit failure coil 2 -

47 Low flow unmetered air (check for small vacuum leaks, injector o'rings, gaskets etc.)
E4OD transmission 4x4 switch/circuit problem -

48 High flow unmetered air (check for large vacuum leak, inlet hoses etc.)
Electronic Ignition - coil primary circuit failure -

49 Electronic Ignition - spout signal circuit problem -
Transmission 1/2 shift problem -

51 Engine Coolant Temperature (ECT) sensor signal is/was too high -

52 Power Steering Pressure Switch/circuit open -
(R) Did you turn wheel during test ?

53 Throttle Position sensor too high -

54 Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal high -

55 No or low (under 7.5 V) Key Power to PCM pin 5

56 Vane Air Flow (VAF) or Mass Air Flow (MAF) sensor high -
Transmission Oil Temperature sensor too high - Transmissions

57 Intermittent in Park/Neutral/ Switch or Neutral Pressure switch circuit - PNP or Transmissions
1990 Scorpio - Octane jumper installed (information only code - to inform you if it is installed or not)

58 Idle Tracking Switch (ITS) signal problem
Vane Air Temperature (VAT) sensor out of range or open -

59 AXOD 4/3 circuit fault - Transmissions
3.0L SHO - Low speed fuel pump circuit problem - Power / Fuel Pump Circuits
Transmission 2/3 shift problem - Transmissions
1990 Scorpio - Idle jumper installed (information only code - to inform you if it is installed or not)

61 Engine Coolant Temperature (ECT) sensor is or was too low -

62 AXOD (KOEO only) 3/2 circuit short to ground - Transmissions
AXOD (KOEO AND KOER) 4/3 circuit failure - Transmissions
E4OD excessive converter clutch slippage - Transmissions

63 Throttle Position Sensor (TPS) signal too low TPS

64 Intake Air Temperature (IAT) or Vane Air Temperature (VAT) signal low or grounded -

65 Check intermittent HO2S (signal or ground) -
(R) E4OD truck - cycle OD cancel switch after engine ID is received -
1984 3.8L ONLY - O, M Battery voltage high (check for electrical system overcharging)

66 Vane Air Flow (VAF) or Mass Air Flow (MAF) signal low -
Transmission Oil Temperature (TOT) signal low (possibly grounded) -

67 Park/Neutral circuit fault -
Transmission Manual Lever Position (MLP) sensor circuit -
(M) Intermittent Park Neutral Position (PNP) sensor fault -

68 Idle Tracking Switch (ITS) circuit (possibly grounded) -
Vane Air Temperature (VAT) sensor out of range or grounded -
3.8L AXOD -Transmission Temperature Switch (TTS) open -
Electronic Transmission - Transmission Oil Temperature (TOT) sensor was overheated -

69 AXOD transmission (O) 3/2 switch closed (possible short circuit) -
AXOD (M) 3/2 switch open (poss short to power) -
E4OD 3/4 shift problem -

70 (M) 3.8L AXOD - Data link to instrument cluster fault. Service any other EEC codes, erase memory and retest.
If code is still present refer to instrument cluster diagnosis manual.

71 (M) 1.9L TBI, 2.3L TBI, 2.5L TBI - ITS signal was grounded when throttle should have been opening ITS -
ISC motor problem or Idle Tracking Switch (ITS) signal wire shorted to ground -
(M) 1.9L MFI - PCM re-initialized. Possible electrical noise, case ground or intermittent VPWR problem -

72 (R) No MAP or MAF change in "goose" test - retest, check for frequency or voltage change -
(M) 1.9L MFI - VPWR circuit to PCM was intermittent - VPWR Diagnosis
(M) 2.3L T/C - PCM re-initialized. Possible electrical noise, case ground or intermittent VPWR problem -

73 (O) Rerun test, if 73 is still output replace TPS
(R) No Throttle Position Sensor (TPS) change in "goose" test. Must get at least 25% throttle rotation -

74 Was brake depressed after engine ID was received ?
Brake On Off (BOO) signal open or short to ground -

75 Brake On Off (BOO) signal shorted to power -

76 Vane Air Flow (VAF) did not respond to "goose" test -


77 System did not receive "goose" test -

78 (M) VPWR circuit to PCM was intermittent or the PCM is bad VPWR Diagnosis

79 A/C is on or pin 10 is shorted to power

80 SERIES CODES GENERALLY ARE CIRCUIT PROBLEMS THAT COULD BE WIRING, RELAY OR SOLENOID RELATED.
ONLY ONE OF THE CIRCUITS LISTED UNDER THE CODE IS USED ON EACH VEHICLE. THE FAULT IS IN WHICHEVER SOLENOID OR CIRCUIT IS PRESENT ON THE VEHICLE

81 Boost control solenoid -

82 2.3L TC - Fan Control wire shorted to ground - A/C and Fan Circuits

83 High Electro Drive Fan circuit fault -
EGR Control solenoid -

84 EGR Vacuum Regulator -
EGR cutoff solenoid -
EGR Vent solenoid -

85 2.3L T/C Automatic - 3/4-4/3 Shift solenoid -
CANP solenoid (ALL 1989) -
(M) 1.9L MFI - System has corrected rich condition -

86 2.3L or 2.9L Truck - A4LD 3/4 shift solenoid -
(M) 1.9L MFI - System has corrected lean condition -

87 (O) Fuel pump circuit fault (check inertia switch) -
Vehicles with 2BBL carb - Temperature Compensated Accelerator Pump Solenoid -
(M) intermittent in fuel pump primary circuit -
NOTE: On some Escorts with automatic seat belts this code is normal IN MEMORY due to the wiring

88 Throttle Kicker Solenoid -
Variable Voltage Choke relay circuit fault -
Fan Control circuit fault -
A4LD - Converter Clutch Override solenoid -
Electronic Ignition - IDM, DPI or spout circuit fault -

89 A4LD - Converter Clutch Override solenoid -
AXOD Torque Converter Control solenoid circuit -
Exhaust Heat Control (heat riser) solenoid circuit -

90 SERIES FUEL/AIR INJECTION CODES ON VEHICLES WITH DUAL OXYGEN SENSORS REFER TO THE LEFT OR FRONT SENSOR. EXCEPT: 1984-1988 3.8L ENGINES: RIGHT SENSOR

91 (R, M) System running lean -
Transmission SS 1 circuit/solenoid problem -

92 (R) System running rich -
Transmission SS 2 circuit/solenoid problem -

93 (O) Throttle linkage binding or bad ISC motor ISC (R) HO2S not reading -
Transmission TCC circuit/solenoid problem -

94 AIR system inoperative -
Transmission TCC circuit/solenoid problem -

95 (O) Fuel pump: open, bad ground or always on -
(R) AIR not Diverting (AIRD) - Air Injection
(M) Possible bad fuel pump ground or open between fuel pump and pin 8 at PCM (Fuel Pump Monitor signal) -

96 (O) Fuel pump monitor circuit shows no power -
(R) AIR Bypass (AIRB) not working -
(M) (Service 87 code first if present) Fuel pump relay or battery power feed was open -

97 E4OD OD cancel light circuit failure -

98 (R) Did not pass KOEO yet (Get 11 in KOEO first)
Transmission EPC circuit/solenoid failure -

99 (R) ISC needs to learn (Let idle for 2 minutes; Erase memory and retest)
Transmission EPC circuit/solenoid failure -

21 Engine Coolant Temperature (ECT) sensor out of range -

So I need a new sensor right?

33 ALL - (O, M) EGR did not open/ respond during test or if memory code, did not open intermittently -

Does this mean my EGR is bad?

41 (R) System lean -
(M) System was lean for 15 seconds or more (no HO2S switching)

How could it be lean when it smells SOOO rich?

81 Boost control solenoid -

What is this??

Smoked88GT said:

21 Engine Coolant Temperature (ECT) sensor out of range -

So I need a new sensor right?

33 ALL - (O, M) EGR did not open/ respond during test or if memory code, did not open intermittently -

Does this mean my EGR is bad?

41 (R) System lean -
(M) System was lean for 15 seconds or more (no HO2S switching)

How could it be lean when it smells SOOO rich?

81 Boost control solenoid -

What is this??

Click to expand...

......Bump.......

Smoked88GT said:

21 Engine Coolant Temperature (ECT) sensor out of range -

So I need a new sensor right?

33 ALL - (O, M) EGR did not open/ respond during test or if memory code, did not open intermittently -

Does this mean my EGR is bad?

41 (R) System lean -
(M) System was lean for 15 seconds or more (no HO2S switching)

How could it be lean when it smells SOOO rich?

81 Boost control solenoid -

What is this??

Click to expand...

For Code 21. Not it does not mean you need a new sensor all the time. If the KOEO test was run with a cold engine. This code will show. Test should be run with a fully warmed up engine.

Code 33. Again doesnt mean you need a new EGR. This code means the no EGR valve movement was detected.

Reasons. Loss of a vacuum to the EGR or a Bad EVR solenoid.
Check for a vacuum at the EGR first.

Code 41 is a lean code. But the computer is trying to compensate for the code. So it dumps more fuel. Kinda misleading in a way. Its either from an exhaust leak, bad sensor, or a vacuum leak concentrating on the passenger bank.

Put the passenger side 02 in the driver side h-pipe. and rerun the codes. If code 91 now shows. Then you need to replace the 02 sensor that is now in the driver side h-pipe. If not and code 41 still shows. then its either a wiring problem or a actual lean condition. When this code shows in the KOEO test it is a memory code. So you need to run the engine running codes first and foremost. If the code is there still. Then you need to do what I suggested above.

Code 81 is not a boost solenoid code in this application. It is a TAD solenoid circuit failure. This is part of the smog system. That controls the TAD valve. That directs AIR form the Smog pump either to the heads, or down stream to the Cats.

Either the TAD sensor is bad, the connector is not plugged into it, or the wiring is snafu'd somewhere.

89coupe said:

For Code 21. Not it does not mean you need a new sensor all the time. If the KOEO test was run with a cold engine. This code will show. Test should be run with a fully warmed up engine.

Code 33. Again doesnt mean you need a new EGR. This code means the no EGR valve movement was detected.

How vital is the EGR?

Reasons. Loss of a vacuum to the EGR or a Bad EVR solenoid.
Check for a vacuum at the EGR first.
I shall check for vacuum

Code 41 is a lean code. But the computer is trying to compensate for the code. So it dumps more fuel. Kinda misleading in a way. Its either from an exhaust leak, bad sensor, or a vacuum leak concentrating on the passenger bank.

Put the passenger side 02 in the driver side h-pipe. and rerun the codes. If code 91 now shows. Then you need to replace the 02 sensor that is now in the driver side h-pipe. If not and code 41 still shows. then its either a wiring problem or a actual lean condition. When this code shows in the KOEO test it is a memory code. So you need to run the engine running codes first and foremost. If the code is there still. Then you need to do what I suggested above.

Thats brilliant! I'll have to try that as well. Now this could be the big reason for running rich, yes?

Code 81 is not a boost solenoid code in this application. It is a TAD solenoid circuit failure. This is part of the smog system. That controls the TAD valve. That directs AIR form the Smog pump either to the heads, or down stream to the Cats.

Either the TAD sensor is bad, the connector is not plugged into it, or the wiring is snafu'd somewhere.
well I removed smog, I have the delete pulley there right now. The pipe going to the back of the heads, I left it on and I plugged the whole that went to the plumbing for the smog tube. Could that be the issue?

Click to expand...

Okay thanks. All of that is making more sense

OH!!! I just had a thought...so my EGR isn't moving right? So I have really high pitched whistle, not sure if its an intake leak or anthing but it sure is WAY loud, sounds like I have a turbo, could that be the EGR?

And one more thing, When I was in 1st and mashed the throttle, power killed right around 4800-5000rmp, almost like a turned the car off for a split second...now what the heck could that be?