Three-digit EEC codes

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Model years 1989 to 1991 used 2-digit codes. 1992-1995 use 3-digit codes. 1996-1999 use 5-digit codes (OBD-II).

Code KOEO KOER Continuous Check Engine Description
111 KOEO.gif KOER.gif Cont.gif Systems pass.
112 KOEO.gif KOER.gif CEL.gif Air charge temperature (ACT) sensor indicated 254degF. Circuit grounded.
113 KOEO.gif KOER.gif ACT indicated -40degF. Circuit open.
114 KOEO.gif KOER.gif ACT out of self-test range.
115 KOEO.gif KOER.gif Engine coolant temperature (ECT) sensor out of self-test range.
117 KOEO.gif Cont.gif CEL.gif ECT indicated 254degF. Circuit grounded.
118 KOEO.gif Cont.gif CEL.gif ECT indicated -40degF. Circuit open.
121 KOEO.gif KOER.gif Cont.gif Throttle position (TP) sensor out of self-test range.
122 KOEO.gif Cont.gif CEL.gif TP sensor circuit below minimum voltage.
123 KOEO.gif Cont.gif CEL.gif TP sensor circuit above maximum voltage.
124 Cont.gif TP circuit output higher than expected.
125 Cont.gif TP circuit output lower than expected.
126 Cont.gif CID circuit failure.
129 KOER.gif Insufficient mass air flow (MAF) change during dynamic response test.
136 KOER.gif CEL.gif HEGO sensor indicates system lean (LH).
137 KOER.gif HEGO sensor indicates system rich (LH).
139 Cont.gif No HEGO switching detected (LH).
144 Cont.gif No HEGO switching detected (RH).
157 KOER.gif Cont.gif CEL.gif MAF circuit below minimum voltage.
158 KOEO.gif KOER.gif Cont.gif MAF circuit above maximum voltage.
159 KOEO.gif KOER.gif MAF out of self-test range.
167 KOER.gif Insufficient throttle position change during dynamic response test.
171 Cont.gif No HEGO switching detected / adaptive fuel at limit (RH).
172 KOER.gif Cont.gif CEL.gif HEGO sensor indicates system lean (RH).
173 KOER.gif Cont.gif HEGO sensor indicates system rich (RH).
174 Cont.gif HEGO switching time is slow (RH).
175 Cont.gif No HEGO switching detected / adaptive fuel at limit (LH).
176 Cont.gif CEL.gif HEGO sensor indicates system lean (LH).
177 Cont.gif HEGO sensor indicates system rich (LH).
178 Cont.gif HEGO switching time is slow (LH).
179 Cont.gif Adaptive fuel lean limit is reached (RH).
181 Cont.gif Adaptive fuel rich limit is reached (RH).
182 Cont.gif Adaptive fuel lean limit is reached at idle (RH).
183 Cont.gif Adaptive fuel rich limit is reached at idle (RH).
184 Cont.gif MAF higher than expected
185 Cont.gif MAF lower than expected
186 Cont.gif Injector pulse width higher than expected.
187 Cont.gif Injector pulse width lower than expected.
188 Cont.gif Adaptive fuel lean limit is reached (LH).
189 Cont.gif Adaptive fuel rich limit is reached (LH).
191 Cont.gif Adaptive fuel lean limit is reached at idle (LH).
192 Cont.gif Adaptive fuel rich limit is reached at idle (LH).
211 Cont.gif PIP circuit fault.
212 Cont.gif IDM circuit failure / SPOUT circuit grounded.
213 KOER.gif SPOUT circuit open.
214 Cont.gif CID circuit failure.
215 Cont.gif Coil 1 primary circuit failure.
216 Cont.gif Coil 2 primary circuit failure.
217 Cont.gif Coil 3 primary circuit failure.
219 Cont.gif SPOUT signal defaulted to 10 degrees BTDC / SPOUT circuit open.
225 KOER.gif Knock sensor (KS) not sensed during dynamic response test.
326 KOER.gif Cont.gif DPFE circuit voltage lower than expected.
327 KOEO.gif KOER.gif Cont.gif DPFE output circuit below minimum voltage.
332 KOER.gif Cont.gif EGR valve opening not detected.
335 KOEO.gif DPFE sensor voltage higher or lower than expected.
336 KOER.gif Cont.gif Exhaust backpressure high / PFE circuit voltage high.
337 KOEO.gif KOER.gif Cont.gif DPFE output circuit above maximum voltage.
411 KOER.gif Cannot control RPM during self-test low RPM check.
412 KOER.gif Cannot control RPM during self-test high RPM check.
452 Cont.gif Insufficient input from vehicle speed sensor (VSS).
511 KOEO.gif EEC processor ROM test failure.
512 Cont.gif EEC processor RAM test failure.
513 KOEO.gif Failure in EEC processor internal voltage.
519 KOEO.gif PSPS circuit open.
521 KOER.gif PSPS circuit did not change states.
522 KOEO.gif Indicates vehicle in gear.
524 KOEO.gif Cont.gif Low speed fuel pump circuit open (battery to ECA).
526 KOEO.gif NPS circuit closed; air conditioning on.
536 KOER.gif Cont.gif BOO circuit failure.
538 KOER.gif Operator error (dynamic response / cylinder balance tests).
539 KOEO.gif Air conditioning on / defrost on during KOEO.
542 KOEO.gif Cont.gif Fuel pump secondary circuit failure.
543 KOEO.gif Cont.gif Fuel pump secondary circuit failure.
551 KOEO.gif IAS circuit failure.
556 KOEO.gif Cont.gif Fuel pump primary circuit failure.
557 KOEO.gif Cont.gif Low speed primary fuel pump circuit failure.
558 KOEO.gif EVR circuit failure.
564 KOEO.gif EDF circuit failure.
565 KOEO.gif CANP solenoid circuit failure.
565 KOER.gif Hard fault present (FMEM mode).