B20AD Diagnostic Trouble Code

B20AD 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 B20AD diagnostic trouble code may include:

Hesitation upon acceleration
Excessive exhaust leak
Rich or lean exhaust
Reduction in engine performance, especially at low RPM levels

Possible Causes :

A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Some aftermarket accessories and performance modifications
Dirty air cleaner element Damaged DPF

Repair Processes :

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. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

Process Tips

Diagnostic trouble code B20AD 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 B20AD.

Fortunately, B20AD is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B20AD Trouble Code For Specific Cars

B20AD Porsche 911 Type 996 FTS Low - Fuel Pump Temperature Sensor Low
B20AD Alfa Romeo Spider Air Bag Crash Sensor #2 Feed/Return Circuit Open
B20AD Armstrong Siddeley 18 Air Suspension LR Height Sensor Circuit Short To Battery
B20AD Fiat 128 Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)
B20AD Fiat 133 Knock Sensor 2 Circuit Range/Performance (Bank )
B20AD Nissan Platina Cooling Fan Rationality Check Malfunction
B20AD Suzuki Hayabusa Metering Oil Pump Temperature Sensor Circuit Malfunction