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Hello and welcome to JA!!!
I'm Billy and i will help you with this.
There are two service indicators on screen or dash:
- one service indicator that needs to be reset manually or using a scan tool every time you service this vehicle, and if it is the one lit, you have nothing to worry about, as this one will light at specific intervals (e.g. every 10000 miles) as just a reminder so you change oil and service vehicle.
- the other service indicator, is the check engine light, which indicates a fault in the engine management system, which could be anything from coolant temperature sensor, to oxygen sensors or catalytic converters. Now this light, you should have it checked and have the codes retrieved and read, so you know how deep this goes, in order to decide on the vehicle.
Having said that, i suggest you check the following (that applies to any second hand vehicle you buy):
- check engine oil level and quality (burnt, golden...)
- check coolant level and quality (check if it is muddy or clean etc...)
- listen to the engine while cold (it should not have ticking noises)
- wait until engine is warm, then have some one rev it up a bit while you look at exhaust (if you see oily bluish smoke then engine is in trouble)
- press brake pedal, and shift through the gears while stationary (shifting should be smooth)
These are the main things you might want to check (of course other than looks, space...), now if you need further info on the subject, feel free to ask