1995 Geo Metro Base, 2D HatchbackFACTORY OEM SERVICE PROCEDURE

Engine Controls DTCS (1.0L)

ENGINE CONTROLS DTCS (1.0L)

OEM Code Description
13 HEATED OXYGEN SENSOR, SIGNAL VOLTAGE DOES NOT CHANGE
14 ECT SENSOR, HIGH VOLTAGE INPUT - LOW TEMP INDICATED
15 ECT SENSOR, LOW VOLTAGE INPUT - HIGH TEMP INDICATED
21 THROTTLE POSITION (TP) SENSOR, HIGH VOLTAGE INPUT
22 THROTTLE POSITION (TP) SENSOR, LOW VOLTAGE INPUT
23 IAT SENSOR, HIGH VOLTAGE INPUT - LOW TEMP INDICATED
24 VEHICLE SPEED SENSOR
25 IAT SENSOR, LOW VOLTAGE INPUT - HIGH TEMP INDICATED
31 MAP SENSOR, LOW VOLTAGE INPUT - LOW MANIFOLD PRESSURE
32 MAP SENSOR, HIGH VLTGE INPUT - HIGH MANIFOLD PRESSURE
41 IGNITION SIGNAL CIRCUIT, NO SIGNAL
42 CAMSHAFT POSITION SENSOR CKT, NO SIGNAL FOR 2 SECONDS
46 IDLE SPEED CONTROL MOTOR CIRCUIT
51 EXHAUST GAS RECIRCULATION
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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