C3903 Land Rover Discovery 5 OBD Code

OBD/2 C3903 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.

To check for an open circuit, trace along the length of the transmission control circuit, checking for breaks in the wiring. Repair any broken wiring and make sure all connectors are fully seated and locked.Pay close attention to connectors, looking for corrosion, bent or broken pins, or moisture in the connector. Repair any connector issues even if they are not specifically part of the transmission control circuit as they may serve a function in providing power to the transmission control circuit.

C3903 Land Rover Discovery 5 Error Code Repair Process :

The scent may C3903 signal oil or coolant leaking from their normally closed-loop systems, or it may indicate dangerous exhaust gases invading your car's interior. Car and truck exhaust contains toxic gases such C3903, so if the inside of your car air suspension lr corner down timeout as if you were standing behind your car, get out and get it fixed. Fight the urge to take a little nap first. So sleepy. That's the carbon monoxide talking, friends. At least open a window on your way to the shop.

Difficulty Level (Soso)

Repair Time (50 Min.)

Cost Prediction : $ 90-120

Common Causes of Land Rover Discovery 5 C3903 OBD2 Code

A common cause of code C3903 is the failure of Air Suspension LR Corner Down Timeout, but there are several other possible causes as well, such as ;

• Dirty Oil
• Air fuel ratio (A/F) Sensor 1 Bank 1 harness is open or shorted
• Faulty oil control valve (OCV)
• Loss of ground.

C3903 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.

C3903 code for other Land cars

You can view according C3903 DTC for your car model. We selected several models to see obd2 solutions click and view it.

• C3903 Land Rover Defender
• C3903 Land Rover Discovery
• C3903 Land Rover Discovery 2
• C3903 Land Rover Discovery 3
• C3903 Land Rover Discovery 4
• C3903 Land Rover Evoque
• C3903 Land Rover Freelander
• C3903 Land Rover Freelander 2
• C3903 Land Rover Lr2
• C3903 Land Rover Lr3
• C3903 Land Rover Range Rover
• C3903 Land Rover Serie I
• C3903 Land Rover Series I
• C3903 Land Rover Series Ii
• C3903 Land Rover Series Iii
• C3903 Land Rover Velar

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