C3493 Volvo 760 OBD Code

OBD/2 C3493 error code description and symptoms.

HO2S Sensor Circuit Malfunction (HO2S-11) During testing the HO2S Heaters are checked for opens/shorts and excessive current draw.
The test fails when current draw exceeds a calibrated limit and/or an open or short is detected. Short to VPWR in harness or HO2S. Water in harness connector. Open VPWR circuit. Open GND circuit. Low battery voltage. Corrosion or poor mating terminals and wiring Damaged HO2S heater. Damaged PCM.

As long as the throttle plate remains closed, the idling speed and quality is controlled by the PCM via the idle control valve, and as can be seen from the above it should be clear that idle control on a gasoline engine is a complex affair. For instance, if the engine is started in sub-zero temperatures, the PCM will command the idling control valve to allow less air to enter the engine to enrich the air/fuel mixture to create a condition which is roughly analogous to how chokes worked on carburetted engines to control idling in cold weather.

C3493 Volvo 760 Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine C3493 light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If passenger door disarm switch ckt short to ground so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the passenger door disarm switch ckt short to ground.

Common Causes of Volvo 760 C3493 OBD2 Code

A common cause of code C3493 is the failure of Passenger Door Disarm Switch ckt Short to Ground, but there are several other possible causes as well, such as ;

Exhaust tube
1Camshaft Position Sensor circuit poor electrical connection
Foreign matter caught in fuel filler cap
Foreign matter caught in fuel filler cap

C3493 is a kind of Chassis Trouble Code

Diagnosing chassis noises can be one of the most frustrating problems technicians face. Fortunately, manufacturers have engineered noise, vibration and harshness (NVH) diagnostic techniques and equipment to find the source of the noise.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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C3493 Volvo 760 OBD Code

C3493 Volvo 760 Error Code Repair Process :

Common Causes of Volvo 760 C3493 OBD2 Code

C3493 code for other Volvo cars