B3661 Diagnostic Trouble Code

B3661 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 B3661 diagnostic trouble code may include:

Faulty or damaged wiring
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Poor fuel economy
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 vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly 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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code B3661 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 B3661.

Fortunately, B3661 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B3661 Trouble Code For Specific Cars

B3661 Renault Scenic 2 High Fan Control Primary Circuit Malfunction
B3661 Lamborghini Gallardo Shift/Timing Solenoid Intermittent
B3661 Ds Ds7 Crossback Ignition/Distributor Engine Speed Input Circuit Range/Performance
B3661 Toyota Fortuner Oil Change Lamp Circuit Short To Battery
B3661 Chevrolet Comodoro Driver Sid, Side mount Airbag Circuit Short to Ground
B3661 Alvis Crested Eagle Air Bag Safing Sensor Output Circuit Short To Ground
B3661 Daf 46 Gear Lever X Position Circuit