Chevrolet Sonic Repair Manual: Heated Oxygen and Oxygen Sensor Caution

Caution:

Do not remove the pigtail from either the heated oxygen sensor (HO2S) or the oxygen sensor (O2S). Removing the pigtail or the connector will affect sensor operation.

Handle the oxygen sensor carefully. Do not drop the HO2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Do not use cleaning solvents of any type.

Do not repair the wiring, connector or terminals. Replace the oxygen sensor if the pigtail wiring, connector, or terminal is damaged.

This external clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors, or terminals could result in the obstruction of the air reference and degraded sensor performance.

The following guidelines should be used when servicing the heated oxygen sensor:

• Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor causing poor performance.
• Do not damage the sensor pigtail and harness wires in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems.
• Ensure the sensor or vehicle lead wires are not bent sharply or kinked. Sharp bends or kinks could block the reference air path through the lead wire.
• Do not remove or defeat the oxygen sensor ground wire, where applicable. Vehicles that utilize the ground wired sensor may rely on this ground as the only ground contact to the sensor. Removal of the ground wire will cause poor engine performance.
• Ensure that the peripheral seal remains intact on the vehicle harness connector in order to prevent damage due to water intrusion. The engine harness may be repaired using Packard's Crimp and Splice Seals Terminal Repair Kit. Under no circumstances should repairs be soldered since this could result in the air reference being obstructed.

Heated Oxygen Sensor Resistance Learn Reset Caution

Caution: When replacing the HO2S perform the following: A code clear with a scan tool, regardless of whether or not a DTC is set HO2S heater resistance learn reset with a scan tool, ...

Mass Airflow Sensor Replacement

Mass Airflow Sensor Replacement Callout Component Name 1 Mass Air Flow Sensor Fasteners (Qty: 2) ...

Other materials:

Drum Brake Adjustment
Special Tools CH-21177-A Drum to Brake Shoe Clearance Gauge For equivalent regional tools, refer to Special Tools. Warning: Refer to Brake Dust Warning. Ensure the park brake lever is in the fully released position. Remove the front floor console cupholder insert. Note ...

Park - Engine Running (Gen 2)
When the gear selector lever is in the Park (P) position, fluid is drawn into the pump through the transmission fluid filter assembly. Line pressure is then directed to the following valves: Fluid Pressure Directed in Preparation for a Shift Manual Valve Mechanically controlled by ...

Camshaft Sprocket Removal
Loosen the intake camshaft sprocket bolt (1) while holding the hexagon of intake camshaft (2) with a wrench. Remove the intake camshaft sprocket bolt (1) and the intake camshaft position exciter wheel (2). Remove the intake camshaft sprocket ( ...