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It doesn't have one!
1.8 i-VTECs have a timing chain instead, which is a very good reason to buy one. It should last the life of the car, I've seen 'up to 300,000 miles' quoted too.
Very little needs doing south of 100k. The coolant needs changing at 120k IIRC. I'd be disappointed if I had to do anything major before 150k, hopefully 200k if I still have it then.
Honda make amazing engines and the engine will almost certainly outlast the rest of the car. As the world's biggest engine manufacturer they're kinda the KMC of engine makers.
Oh yeah, while I'm here, thanks everyone for warning me off the Civic with the air con issue. I think with hindsight it was best avoided.
I bought this from a nice couple in Ruislip last weekend. It's only done 67000 miles and the only niggle apart from a smashed front fog light (I've already got a replacement, just need to fit it) is the left power folding mirror which doesn't turn in sometimes. This is caused by a faulty resistor in the mirror shut off device, I tried to fit a new £1.60 resistor myself last night and cocked it up, which I'm annoyed with myself about because the replacement SOD I've just ordered cost £23. Outrageous.
After years of driving poverty spec cars I'm enjoying having luxuries like a panoramic sunroof, dual zone air con, auto lights/wipers, reversing sensors and cruise control 😂