B2459 Diagnostic Trouble Code

B2459 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 B2459 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

Process Tips

Diagnostic trouble code B2459 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 B2459.

Fortunately, B2459 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B2459 Trouble Code For Specific Cars

B2459 Porsche 935 Fuel Level Input Circuit Low
B2459 Renault Juvaquatre Glow Plug/Heater Circuit "A" Malfunction
B2459 Fiat 1500
B2459 Emf 30 Injection Pump Fuel Metering Control "A" Range/Performance (Cam/Rotor/Injector)
B2459 Simca Type 11 Intermediate Shaft Speed Sensor Circuit No signal
B2459 Saab 9-x Ignition Tamper Circuit Failure
B2459 Armstrong Siddeley 18 Air Suspension LR Height Sensor Circuit Short To Battery