Oxygen Sensor Diagnostic Trouble Code 11 (93-36-013)

Publication date: 1993-09-01
Reference number: 93-36-013

OXYGEN SENSOR DIAGNOSTIC TROUBLE CODE 11

TECHNICAL SERVICE BULLETIN

Reference Number(s): 93-36-013, Date of Issue: September, 1993

OXYGEN SENSOR DIAGNOSTIC TROUBLE CODE 11

Model(s): Hyundai All Models

Group: Engine Electrical

Bulletin No.: 93-36-013

Date: September, 1993

SERVICE INFORMATION

The Oxygen Sensor (O2) measures the amount of oxygen in the exhaust gas and converts this quantity into a voltage to be analyzed by the ECM. A normal oxygen sensor signal will constantly fluctuate above and below 500 millivolts (mv) when the fuel injection system is in closed loop operation. The air/fuel mixture is considered rich when the oxygen sensor signal is above 500 mv; the mixture is considered lean when the signal is below 500 mv.

An incorrect oxygen sensor signal can result in poor driveability and an oxygen sensor diagnostic trouble code being set. When troubleshooting a vehicle with an oxygen sensor code stored in the ECM, consider the possible causes listed below:

Air intake leak behind the air flow sensor. Ensure that the air flow sensor gasket is seated properly.
Throttle position sensor (TPS) out of adjustment.
Oxygen sensor or harness wiring open or shorted to ground.
High resistance in the engine ground circuit or oxygen sensor ground circuit.
Clogged or leaky fuel injector(s).
Volume air flow sensor (VAFS) circuit failure.
Engine coolant temperature sensor failure.
Incorrect fuel pressure.
Defective oxygen sensor.
Silicone contamination of the oxygen sensor caused by penetrating oils, silicone lubricants or sealers.