Price of Injector for petrol BMW 1 Series

Belenus

BMW 116i second generation Series1 F20, 1.6 turbo engine, petrol, 6 speed manual. January 2015 so now over nine years old. 36,000 miles.

The car was serviced today by a reputable garage that I have used regularly for many years. I asked them to identify an intermittent misfire.

According to their OBD check, the number 3 cylinder injector is faulty and needs replacing. They have warned me that this will not be cheap. They are trying to source a quality replacement.

I asked if I should have all 4 injectors replaced. They said no, as that might cost as much as £1,400 or more.

Googling suggests anything from under £100 up to nearly £400 per injector. I don't have the knowledge to know what to avoid and what is safe to buy but I do know that buy cheap usually means buy twice or three times

I don't want to buy a cheap injector that might give poor performance or fail quickly. If it costs £400 to get the best quality then so be it. I will go for that.

I trust this garage to get me a good deal and not rip me off.

Can I get decent quality for less than about £400? If so, where can they be sourced? What brands are good and what brands are to be avoided?

Thanks

daveyjp

Before they jump down the rabbit hole of changing an injector is it possible for them to swap it with one of the others to check the fault follows the injector and doesn't stay at cylinder 3?

Goudy

Yes, it needs some more diagnostic work before swapping parts out.

There are couple of known faults with the ECUs, depending on model, that effect the injector/injectors performance.

One is a short circuit coil problem which leads to the ECU drawing excessive power.
This can cause injector shut down on one or more cylinders, hence misfires that are initially traced to the injector.
An ECU repair and then, before running the engine, replace the coils.

The other which I believe is for a later car (but yours might be a crossover model) is just a straight signal issue from the ECU that causes misfires and injector shutdown.
A ECU repair should be enough to fix that one.

As Daveyjp writes, swapping the injectors over could help.
If the misfiring injector problem moves to the new cylinder, it's likely the injector that's the problem.
If the problem still sticks with that particular cylinder after the swap, something driving that injector is amiss.

Both problems can be found here.
Common BMW ECU Problems (ecutesting.com)