Bosch spark plugs

[Hilton Africa]

Hi, which Bosch spark plug do I fit into my Toyota Auris 2012, 1.3? It now has 183693 km on the clock. Please advise

[Mooly]

Assuming you mean the 1.33L engine then I would only fit the current recommended plugs from Toyota. In the UK the specification was changed to a hotter plug a few years back.

I've heard of reports of poor running with alternatives.  

[flash22]

Factory is Denso, they tend to run much better on the Denso plugs, especially the 1.33

If this is a South African car, specifications can vary a lot

[Devon Aygo]

Original plugs would have been 90919-01253 which where Denso SC20HR11 Toyota/Denso have since replaced these with 90919-01275 which are Denso SC16HR11

[AisinW]

Yes, SC16HR11 is 1 step hotter than the old plugs. It is probably from the obvious reason that many 2010-2012 Prius owners have oil burning issue and hotter plug helps the misfire issue.  I always stick with whatever OEM or revised version per OEM supplier recommendation.  So only Denso, nothing else.