P1998 Renault Express OBD Code

OBD/2 P1998 error code description and symptoms.

The Transmission Fluid Pressure Switch allows the engine's control module (PCM) or Transmission Control Module (TCM) to use hydraulic fluid to engage the clutches in the transmission to allow for smoother shifting while driving. If the PCM or TCM detects an issue with the hydraulic clutch or the pressure switch, the PCM or TCM will set code P1998

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.

P1998 Renault Express Error Code Repair Process :

If your secondary air injection system relay b circuit malfunction 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 P1998 and engine control unit are in charge of monitoring a bunch of different secondary air injection system relay b circuit malfunction, and if they get a reading that's a little out of whack, up pops the check engine light.

Common Causes of Renault Express P1998 OBD2 Code

A common cause of code P1998 is the failure of Secondary Air Injection System Relay B Circuit Malfunction, but there are several other possible causes as well, such as ;

Continuous oil flow to the VCT piston chamber
Erratic camshaft position due to low oil pressure
Faulty front heated oxygen sensor
Exhaust gas leaks

P1998 is a kind of Powertrain Trouble Code

Powertrain of a modern automobile, comprising engine (with exhaust system), transmission, drive shaft, suspension and the wheels. In a motor vehicle, the term powertrain or powerplant describes the main components that generate power and deliver it to the road surface, water, or air.

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

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P1998 Renault Express OBD Code

P1998 Renault Express Error Code Repair Process :

Common Causes of Renault Express P1998 OBD2 Code

P1998 code for other Renault cars