B0940 Trouble Code

View B0940 obd/2 error code description and symptoms. B0940 engine photo

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.

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.

B0940 Error Code Repair Process :

The scent may B0940 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 B0940, so if the inside of your car pressure control solenoid a short circuit 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.

B0940 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.

Common Causes of B0940

A common cause of code B0940 is the failure of Pressure Control Solenoid A Short Circuit, but there are several other possible causes as well, such as ;

Exhaust tube
EVAP system hose leaking
Faulty select solenoid
Clogged or faulty fuel injector (s)

B0940 code for all cars

You can view according B0940 DTC for your car model. We selected several models to see obd2 solutions click and view it.

+B0940 Ford 427

+B0940 Oldsmobile Omega

+B0940 Sunbeam 10

+B0940 Smart Fortwo

+B0940 Mercedes-benz W110

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

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