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