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citroen c1 spark plugs?

just serviced my daughters citroen c1,1.0 petrol and the spark plugs i removed are DENSO K20HR-U11 & the ones supplied are DENSO K16HR-U11 ! whats the difference ? genuine citroen parts and both the plugs look identical . thanks
Glynn, October 2012
K = Thread diameter (19.0mm / 16mm socket)
20 = heat range (16 presumably cooler)?
H = Plug reach (19.0mm thread + 8.5mm electrode)
R = Resistor built in
U = "U" groove in the earth electrode
11 = Gap (11=1.1mm).

Jason, April 2015
link Click here to see other fixes for Citroen C1.