Volvo740turbo srs problem

SOURCE: 1996/volvo/4 dr/850/GLT

First, all these mechanics that you took your car to, did they have the full Volvo diagnostic software? In other words, were they able to access ALL computer systems that the lights were on for? If not, take your car to the Volvo dealer or a shop that has the proper software.
If the alternator does not charge or drops out while the engine is running, it will cause ALL the warning lights to come on.
Did you try adjusting the dash light dimmer control?

SOURCE: I can not reset RSR air bag service urgent message on XC70

if your car has NOT been in a accident the easy fix would is to find a used AIR-BAG SENSOR on a car that HAS-NOT been crased what happened when you did that is sent a code to sensor without dissconnecting battery and light came on I did same ting changing the seat get another air-bag sensor and before installing it dissconnect neg battery terminal tape irt up with duct tape and replce sensor and problem should be solved

SOURCE: Volvo v50 2.0D with a cold start problem

mines got same problem

SOURCE: engine stops after rpm meter drops at once to zero

The fact that the engine dies without warning and that the effect is intermittent indicates that the problem is electrical and that it is most likely a break of some kind. Start from the top and look at the main fuse and the main relay and then the fuel pump relay (sometimes the two are on the same board in the same relay unit). Really inspect these thoroughly and check the solder joints, sometimes you can get an annular crack running around a pin and it will not break the circuit until vibration or high temperature causes the crack to open briefly. When you switch the car on these relays should give a healthy click. Most electrical problems can be found with a wiggle or a tap; wiggle the wires, that is, and tap the device they connect to. A short in the MAF (air density unit) should not necessarily cause the engine to die but maybe to change its idling characteristics. Unplug it whilst the engine is running to see its effect, in fact most devices may be unplugged to check their effect without doing any long term harm. Remove any foam that could interfere with its operation. Spray clean it with electrical spray cleaner (zero residue spray) but do not touch! Do not use carb. cleaner spray as it is too aggressive. 1) Check all the electrical things the ECU takes signals from in order to run the engine: throttle position sensor, idle speed control, Intake air temperature, manifold absolute pressure, engine temperature sensor. crank position sensor, cam position sensor 2) Check electrics, coil (bad to diagnose if intermittent) low tension, high tension distribution, plug leads and plugs, hall effect sensor. 3) Check air: check that all vacuum pipes making any kind of connection with the inlet manifold are air tight with no cracks or loose joints. If you have evaporation emission control make sure that the purge and vent valves close and open when they should. If you have Exhaust gas recirculation check that the valve opens and closes and that all feed ports to it are free and clear of carbon build up. 4) Now check fuel system: pre-pump, main pump, fuel filter, fuel pressure regulator, injectors

Testimonial: "Most of what you wrote has been done I assumed it also to be electrical fuel pump relay new and checked again and my technician has checked the various other electrical items he also tells me that nex time if it happens again i should unplug the MAF (air density unit) to see waht happens. On the other hand he has tesed the device and is passed the test without problems but it is good to know that a short circuit in teh MAF cannot cause symptomes i have other suggestions are welcome jeroen"

SOURCE: 1993 Volvo Station Wagon, Engine Shuts Off intermittently and Turns back on after less than a minute

There is a silinoid under the dash behind the ash tray on mine. It needs to be replaced. I had the same problem and this resolved the issue. I have as Eruopean car michanic and he new axactly what the issue was. I think the relay was Aprox.$ 40.00 easy fix to a very frustrating problem. Try this firsat it'll save you tears.