B0990 Vauxhall Corsa OBD Code

OBD/2 B0990 error code description and symptoms.

Catalytic converters must be warm before they can work properly. On a cold start the PCM provides a rich mixture to keep the cold engine running.
All that extra fuel goes into the catalytic converter. But the exhaust isn't very hot, because, ah, the engine is pretty cold. GM has employed several strategies to fire up the catalytic converter quicker and reduce cold start emissions. One way is to use a secondary air pump that pumps outside air directly into the catalytic converter.

One example of this would be when an automatic vehicle in placed in gear. To prevent the added drag from the torque converter and transmission from reducing the idling speed, the PCM will command the idle control valve to allow more air to enter the engine, while at the same time, adjusting the injector pulse width to inject more fuel to suit the increased amount of air. Note that the idle air control valve is closed by the PCM when the throttle plate is opened to prevent excess air from entering the engine.

B0990 Vauxhall Corsa Error Code Repair Process :

When you turn on the ignition, the Service Engine Soon or Check Engine B0990 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 transmission neutral safety switch open circuit 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 transmission neutral safety switch open circuit.

Common Causes of Vauxhall Corsa B0990 OBD2 Code

A common cause of code B0990 is the failure of Transmission Neutral Safety Switch Open Circuit, but there are several other possible causes as well, such as ;

Dirty Oil
Camshaft advance mechanism binding (VCT unit)
Faulty Air fuel ratio (A/F) Sensor 1 Bank 1
Open VPWR circuit

B0990 is a kind of Body Trouble Code

Auto body problems aren't always easy to spot. Diagnosing auto body problems sometimes requires a little know-how. In this section you'll find articles dedicated to teaching you how to diagnose auto body problems.

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

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B0990 Vauxhall Corsa OBD Code

B0990 Vauxhall Corsa Error Code Repair Process :

Common Causes of Vauxhall Corsa B0990 OBD2 Code

B0990 code for other Vauxhall cars