Car Symptoms
68 symptoms — find the right OBD2 code by what your car is doing.
Check Engine Light on (18)rough idle (4)no noticeable driving symptoms (3)fuel smell (3)poor fuel economy (3)failed emissions test (2)hesitation on acceleration (2)hard starting (2)engine stalling (2)Engine vibration (2)reduced power (2)possible fuel odor (2)transmission shifting issues (2)Check Engine Light (2)decreased fuel economy (1)sulfur/rotten egg smell (1)poor acceleration (1)Engine shaking/rough idle (1)check engine light flashing (STOP immediately if flashing) (1)fuel smell from exhaust (1)hesitation or stumbling on acceleration (1)increased fuel consumption (1)fuel odor near vehicle (1)Engine vibration at idle (1)power loss under load (1)rough running that smooths out at higher RPM (1)black smoke from exhaust (1)power loss (1)hesitation (1)Engine shaking (1)engine pinging/knocking under acceleration (1)possible failed emissions (1)no driving symptoms (1)Speedometer not working or erratic (1)ABS light may also be on (1)ABS warning light on (1)brake warning light may be on (1)ABS system disabled (1)normal braking still functional (1)multiple warning lights (1)engine may not start or run rough (1)transmission may default to limp mode (1)heater output weak (1)engine takes too long to warm up (1)may fail emissions (1)rough running (1)may not start at all (1)Engine stalling at stop lights (1)idle surging (1)RPM dropping too low when AC kicks on (1)engine may run rough or not start (1)multiple random codes (1)transmission may be in limp mode (1)throttle not responding (1)may enter limp mode (1)Airbag warning light on (1)airbag may not deploy in collision (1)ABS light on (1)traction control light may be on (1)speedometer may be erratic (1)difficulty fueling (1)fuel odor (1)possible fuel smell (1)oil pressure gauge erratic or zero reading (1)possible reduced power (1)oil pressure may be low (1)Airbag light on (1)right side airbag may not deploy (1)