Volvo Code Definitions and Retrieval Procedure

Volvo made one of the easier to access code systems of it's time. When you see a check engine light it means the computer has stored a trouble code that is used to define a particular problem. These problem systems can include ignition timing, fuel injector pulse, fuel mixture, fuel evaporation, fuel system and more. Monitoring these system operation is a malfunction detection program. This program keep track of all minimum and maximum out put and operating ranges of adjustable systems. When a particular system is "out of range" for a prescribed amount of time the check engine light will illuminate. 

When the check engine light illuminates the computer has stored a trouble code. The computer trouble codes can be retrieved by locating the diagnostic box which is usually under the hood near the left strut. This box is about two inches by four inches or three by six centimeters. Lift the protective cover, there you will find a button next to a red led light. This light in used to blink out the trouble code which will be coded by flashing on and off. To start the code gathering procedure turn the ignition key to the on position without starting the engine and push the button down for three seconds. The LED light will start to flash followed by a three second pause dividing the trouble code digits. For example if the LED light blinks once and than pauses, blinks two more times and pauses and then finishes with five more blinks the trouble codes will be 125. 

After car repairs have been have and it is time to clear the codes turn the key to the "on" position with the engine not running. Push the button down for five seconds and release, after three more seconds the led light will illuminate, press the button for five more seconds and release. The codes should be cleared, also you can try disconnecting the battery for five minutes and reconnect.

Volvo Diagnostic Code Definitions

111 No faults.

112 ECU.

113 Fuel injectors.

113 Heated Oxygen sensor max enrichment sensed

115 Injector #1.

121 Mass airflow sensor.

122 Air temp sensor signal.

123 Coolant temp sensor signal.

125 Injector #2.

131 Ignition system RPM signal.

132 Battery voltage.

133 Throttle switch signal (idle).

135 Injector #3.

142 ECU faulty.

143 Knock Sensor signal missing or defective.

144 Fuel system load signal (missing or defective).

145 Injector #4.

153 Rear heated oxygen sensor signal.

154 EGR system leakage or excessive flow.

155 Injector #5.

212 Oxygen sensor signal (front sensor on 94 and later models).

213 Throttle switch signal.

214 Ignition RPM signal erratic.

221 Heated Oxygen Sensor (Rich mixture/part throttle).

222 Main relay.

223 Idle valve signal.

224 Coolant temp sensor signal.

225 A/C pressure sensor signal.

231 Lamba adjustment.

231 Heated Oxygen sensor (lean mixture/part throttle) 94up.

232 Lamda adjustment.

232 Adaptive heated O2 sensor control (94up).

233 Idle valve closing signal.

234 Throttle switch signal missing.

241 EGR malfunction.

245 Idle air control valve closing signal.

311 Speedometer signal.

314 Camshaft position signal missing or defective.

315 EVAP emission control system.

321 Cold start valve signal missing.

322 Airflow meter hot wire.

324 Camshaft position signal erratic.

325 ECU memory failure.

335 TCM request for MIL.

411 Throttle switch signal faulty or missing.

413 EGR temp sensor signal incorrect or missing.

414 Turbo boost regulation.

416 Turbo boost reduction from TCM.

425 Temp warning level #1.

431 EGR temp sensor faulty or missing.

432 High temp warning inside ECU.

433 No rear knock sensor signal.

435 Front heated oxygen sensor slow response.

436 Rear heated oxygen sensor compensation.

443 Catalytic converter efficiency.

444 Acceleration sensor signal.

451 Misfire #1 cylinder.

452 Misfire #2 cylinder.

453 Misfire #3 cylinder.

454 Misfire #4 cylinder.

455 Misfire #5 cylinder.

511 Adaptive oxygen sensor control lean mixture at idle.

512 Oxygen integrator at max lean running limit.

513 High temp warning inside ECU.

514 Engine cooling fan low speed signal faulty.

521 Oxygen sensor preheating front.

522 Oxygen sensor preheating rear.

531 Power stage group A.

532 Power stage group B.

533 Power stage group C.

534 Power stage group C.

535 TC control valve signal.

541 EVAP valve signal.

542 Misfire more than one cylinder.

543 Misfire at least one cylinder.

544 Misfire more than one cylinder/catalytic converter damage.

545 Misfire at least one cylinder/catalytic converter damage.

551 Misfire #1 cylinder/catalytic converter damage.

552 Misfire #2 cylinder/catalytic converter damage.

553 Misfire #3 cylinder/catalytic converter damage.

554 Misfire #4 cylinder/catalytic converter damage.

555 Misfire #5 cylinder/catalytic converter damage.

If further assistance is needed, our certified car repair technicians are ready to answer your car questions. Also, gain manufacturer specific instructions and information by clicking - Auto Repair Manual

Related Car Repair Information


Written by
Co-Founder and CEO of
35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


Please use our question form if you have a specific question about your car as we are not able to give you a full answer on this page.

Article first published (Updated 2013-04-10)