Hello when I start my civic check engine light comes on,speedometer&odometer don't work and headlights&taillights kind of blink what could this be?is it a costly repair? Thank you

. Test all under-dash and under-hood fuses with a test light or multimeter:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-46563-3.html#post252145

Be very careful and thorough checking fuses, otherwise it will waste time and money.

. Check for codes with a scanner or code reader.

. Perform tests in Sections A and B below:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-46563.html