U0259 Alfa Romeo 66 OBD Code

OBD/2 U0259 error code description and symptoms.

Output Shaft Speed sensor circuit intermittent failure The output shaft speed sensor signal to the PCM is irregular or interrupted.
Harness connector not properly seated Harness intermittently shorted, or open Harness connector damaged OSS sensor damaged, or not installed properly Verify harness and connector integrity Verify OSS sensor proper installation.

As long as the throttle plate remains closed, the idling speed and quality is controlled by the PCM via the idle control valve, and as can be seen from the above it should be clear that idle control on a gasoline engine is a complex affair. For instance, if the engine is started in sub-zero temperatures, the PCM will command the idling control valve to allow less air to enter the engine to enrich the air/fuel mixture to create a condition which is roughly analogous to how chokes worked on carburetted engines to control idling in cold weather.

U0259 Alfa Romeo 66 Error Code Repair Process :

If your o2 sensor circuit malfunction (bank 2 sensor 3) check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system U0259 and engine control unit are in charge of monitoring a bunch of different o2 sensor circuit malfunction (bank 2 sensor 3), and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Alfa Romeo 66 U0259 OBD2 Code

A common cause of code U0259 is the failure of O2 Sensor Circuit Malfunction (Bank 2 Sensor 3), but there are several other possible causes as well, such as ;

Camshaft Position Sensor harness is open or shorted
Faulty Air Flow Meter
Intake Valve Timing Control Solenoid Valve circuit poor electrical connection
Oil Control Valve (OCV) circuit is open or shorted

U0259 is a kind of Network Trouble Code

U-code indicates that engine communication errors and shows lost communication with engine parts.U-Codes are fairly straight forward, given all of the articles and technical publications that have been written regarding these problematic codes. In most cases, it just comes down to identifying the module that isn't communicating with the other modules on the CAN bus line for whatever reason.

Engine OBD 2 Codes website is a freeware resource center for engine trouble codes.

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U0259 Alfa Romeo 66 OBD Code

U0259 Alfa Romeo 66 Error Code Repair Process :

Common Causes of Alfa Romeo 66 U0259 OBD2 Code

U0259 code for other Alfa cars