I suggest you read an article by Larry Carley as it is very informative.
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Good Luck and Remember.
Change Your Mind, Not Your Oil.
Could be the idling sensor or the EGR Valve
It could be that your car is idling to low, the throttle position sensor can be bad
A bad coolant temperature sensor is one thing that could cause an idling speed problem with a Peugeot 406. There could also be a problem with the idle control valve.
The throttle position sensor (tps) could make the rpms vary.
Mapp sensor or you might need pugs and wires.
Depending on the vehicle the sensor could be located in several places. It is usually on the side or rear of the transmission, and either bolts on or screws in.
Depending on the vehicle, a faulty VSS (Vehicle Speed Sensor) could affect the automatic transmission shift points.
Yes, it could.Yes, it could.
You have a bad Vss Sensor.............. The vehicle speed sensor.
Could be an exhaust leak close to the engine or a bad catalytic converter. It also could be a bad mass airflow sensor.
That problem is very popular believe it or not even in my 1998 model. I was told that it could be an oxygen sensor or a mass air flow sensor. If you are experiencing idling problems where your vehicle cuts off while you are completely stopped or when turning corners then you may possibly need to check the throttle body. It can get pretty cruddy inside and the vehicle has problems breathing.
Perhaps clutch throw-out bearing?
Could be the O2 sensor, which is attached to the exhaust. Has your engine management light been on? If yes chances are it is this sensor. Careful when buying a new one as there are many different variations. Check the number and colour of wires attached to sensor.
could be a bad TPS throttle position sensor OR a bad IAT idle air control temp sensor.
could be a number of things first tap on your mass air flow sensor while it is idling and if it lines out change it. or it could be your IAC (intake air control)
Vehicle Speed Sensor
Vehicle Speed sensor disconnected
The speed sensor on the vehicle could be shot. My vehicle is currently experiencing the same problem. If the odometer doesn't work either, this is likely the problem. Depending on the age/make of the vehicle, could be difficult to find the component.
It could, along with many others causes.
Does it have enough compression?
too much fuel (unburned) getting into the exhaust. could be your oxygen sensor or catalyst converter. less likely, a leaking fuel injector
AnswerIf the engine is idling very low - oil pump may not generate enough pressure, causing light to come on. Make sure you have adequate oil, and that idle speed is correct. If this does not correct, possibly oil pump screen dirty It could also be the oil sensor is bad or leaking. This happened in my 1996 Chevy Corsica. I thought it was the oil pump, but it turned out to be just the sensor that needed to be replaced.
More info will be needed to properly answer your question. There could be a multitude of reasons. Does your vehicle start at all? Does it stall while driving or idling?
Locate the vehicle speed sensor of the vehicle mounted to the rear section of the transmission. Disconnect the electrical connector from the sensor. Remove the retaining bolt from the sensor mounting at the transmission, then pull the sensor out of the transmission. Place the sensor on a flat surface, then slowly turn the sensor gear by hand. Use the voltage meter to check for the pulsing AC voltage from 0 to 0.5 volts. If there is no voltage, the sensor could be defective. Replace the sensor by following the steps for removal in reverse order.