As cossy says....there is no real middle of the road.

The stuff is usually shite, or good. More usually the former.

I've tried a few cheap sensors for various things ( never actual engine control though, just logging ). One failed after 2 days, and was replaced under warranty. The second failed again after a few days.

I tried one of the cheap 4 bar GM copy MAP sensors for logging some stuff....the sensor body actually melted from engine heat and came apart.
Although same with any such sensor, it's just a PCM mount sensor stuffed into a larger external body and in that case glued together with cheap glue.

Over in the US there are many reports of the cheap GM copy sensors failing.

Although no doubt there are thousands out there working too. What do you do ? Risk an engine for same of spending say £100 vs £30 ?

In the US, most are now just starting to use the GM ZR1 3 bar sensor ( which suits a lot too as it simply bolts into the intake, which would need to be adapted for any other applications )
But it's a cheap OEM sensor so you know it will be reliable

https://www.efi-performance.com/product-p/sens05.htm

EU sourced ? ( I've used this myself and it seems to be ok )

https://shop.vems.hu/catalog/sensor-...ple-p-121.html


Or if you search Bosch 4 bar sensor, there are dozens of listings from VW type applications, although mostly diesels, but commonly re-used elsewhere.
Again a bolt in design and many of them also incorporate an air temp sensor.