Re: eec fault 172/173 help
So you have both codes??? 172 is lean and 173 is rich.
I would clear the codes by disconnecting the battery for a minute and see what comes back.
-- Fuel injectors.
-- Secondary Air Injection (AIR) system.
-- MAP sensor.
-- Electronic Ignition Coil Failure.
Remove the PCV valve from the valve cover. Inspect both rocker cover hole and PCV for damage, sludge build up, blockage and movement of valve plunger. Service as necessary.