P1657 Diagnostic Trouble Code

P1657 is a kind of OBD-II Diagnostic P-Powertrain 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 P1657 diagnostic trouble code may include:

Lack of power
Faulty O2 Sensor
Poor acceleration
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 :

If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. 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. 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.

Process Tips

Diagnostic trouble code P1657 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 P1657.

Fortunately, P1657 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1657 Trouble Code For Specific Cars

P1657 Db Rally HO2S Heater Control Circuit Low (Bank 2 Sensor 3)
P1657 Wiesmann Roadster
P1657 Sunbeam 3-litres Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
P1657 Ferrari 330 Insufficient RMP Increase During Spark Test
P1657 Hulme F1 Right Front Wheel Pressure Reduction Performance Problem
P1657 Mercedes Sl 65 Air Bag Crash Sensor #2 Ground Circuit Short To Battery
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