B1140 Diagnostic Trouble Code

B1140 is a kind of OBD-II Diagnostic B-Body Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a B1140 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.

Repair Processes :

Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code B1140 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before B1140.

Fortunately, B1140 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B1140 Trouble Code For Specific Cars

B1140 Mercedes-benz 240 Air Bag passenger Circuit Open - Loop #2
B1140 Porsche 718 Front Sounder Circuit Short to Vbatt
B1140 Mazda Demio 2 Transmission Transfer Case Shift Motor Short Circuit To Battery
B1140 Daewoo Evanda Fuel Volume Regulator Control Circuit/Open
B1140 Ford Van Module Configuration Failure
B1140 Lamborghini 400 Shift Solenoid E Stuck On
B1140 Gkn Fff Output Speed Sensor No Signal