Just tried to start my 2007 307 1.6 s all it does is click and then the anti pollution light comes on and says air bags s/belts faulty?

If the anti-pollution light on your Peugeot 207 VTi is on, it usually indicates a problem with the vehicle's emission control system. This light may appear in different ways, depending on the model and year of your vehicle, but it usually looks like a picture of an engine with "check" written on it.
Here are some steps you can take to address this issue:

1. Check the gas cap: A loose or damaged gas cap can cause the anti-pollution light to come on. Make sure the gas cap is tightened securely and that it is not damaged.
2. Check the oxygen sensor: The oxygen sensor is responsible for monitoring the level of oxygen in the exhaust and adjusting the fuel-to-air ratio. If the sensor is damaged or malfunctioning, it can cause the anti-pollution light to come on. A qualified technician can diagnose and repair the sensor.
3. Check the catalytic converter: The catalytic converter is responsible for converting harmful pollutants into less harmful gases. If the converter is damaged or malfunctioning, it can cause the anti-pollution light to come on. A qualified technician can diagnose and repair the converter.
4. Check the air filter: A dirty or clogged air filter can cause the engine to run rich, which can lead to increased emissions and the anti-pollution light to come on. Replace the air filter if necessary.

If none of these steps solve the problem, it is best to consult a qualified mechanic to diagnose and repair the issue

A sensor dirty or faulty most likely, usually is with C2's, lambda sensor.

engine ecu has fault codes to be read

several parts and sensors cover anti polution problems

It's not unusual for 207s to show the anti-pollution warning randomly. In my experience it isn't significant and you just learn to live with it, but as yours is consistently showing at start up accompanied with the engine management light, it maybe something more serious. If the car appears to be driving okay, then I would be inclined to ignore it, if not, you will have to have a Puegeot dealer put it on their computer diagnostic machine - pricey !

207s have a bad reputation for random fault indications as a whole (Google it), some of which seem to be ambient temperature related - my father's 207 randomly shows the air bag light on very hot days but this goes away after a few start/stop cycles and a drop in temperatures. Fortunately, his MOT is due in March so when it goes for an MOT the light is always off - air bag fault indication showing is now an MOT failure.
Some people wouldn't be happy driving with an air bag indication, or any other fault indication, showing even for a short period of time, so this is a personal decision as to what you do about it.

The problem for engine overheating rise due to insufficient refrigerant. Try recharging the refrigerant tank with fresh refrigerant and water. If the refrigerant in the tank is of poor quality then also engine overheat.

The reason for ABS light to come may be due to air in the brake fluid line. Try brake bleeding to remove the air bubbles. Also the faulty brake actuator line may cause the problem. Check for actuators on each wheel.

Pollution warning light comes on if the exhaust system not works properly. Check for faulty Oxygen sensor or faulty catalytic convertor.

need vechicle model type year.have battery checked.battery cables could be faulty.if all is good. have ECM and BCM checked out.if they go bad they will drain battery.

Replace fuel filter and check for fuel leaks. Check and change the pollution canister or purge valve.

anti pollution fault with fault codes poo87 poo93 i changed fuel filter, so far all ok.

check battery volts should be 12.6 volts. alternator faulty.check under hood see if alternator drive belt tight not too loose.with engine running alternator out put at battery should be 13.5 - 14 .5 volts.

If the Anti pollution warning light is coming on the possible causes are endless. If the car is driving ok then that is a good sign, but please remember that modern management systems can mask problems quite well. The safest advice is to get it looked at and see what fault codes are appearing and then a diagnosis can begin, as leaving it is not going to be a good thing, it can go from a minor problem to more serious issues. At least the light is not flashing, which usually means an emission compliance problem and even more serious, but even so I would advise protecting your vehicle by getting it checked out as soon as possible to avoid potential damage.
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A fault in the ignition can cause an engine misfire and unburnt fuel gets into the exhaust causing the anti-pollution light to be triggered.

Check the ignition system for signs of damp or loose connections.------- I suggest get the car scanned at autozone service center.Its absolutely free to get car scanned.This will show the problem if you receive the error code.-------- Thanks.Helpmech.