# DiagXCar: what's wrong with your car? Plain answers about car problems, codes and costs. Enter an OBD-II code or describe the problem to get the cause, the cost and whether it is safe to drive. ## Warning lights - [Oil pressure warning light](https://diagxcar.com/warning-lights/oil-pressure): Stop driving - [Coolant temperature warning light](https://diagxcar.com/warning-lights/coolant-temperature): Stop driving - [Battery (charging system) warning light](https://diagxcar.com/warning-lights/battery): Drive to a shop this week - [Brake warning light](https://diagxcar.com/warning-lights/brake): Stop driving - [Check engine light](https://diagxcar.com/warning-lights/check-engine): Drive to a shop this week - [Tire pressure (TPMS) light](https://diagxcar.com/warning-lights/tire-pressure): Drive to a shop this week - [ABS warning light](https://diagxcar.com/warning-lights/abs): Drive to a shop this week - [Traction control light](https://diagxcar.com/warning-lights/traction-control): Drive to a shop this week - [Airbag (SRS) warning light](https://diagxcar.com/warning-lights/airbag): Drive to a shop this week - [Power steering warning light](https://diagxcar.com/warning-lights/power-steering): Drive to a shop this week ## Most looked-up codes | Code | Meaning | Verdict | Typical cost | | --- | --- | --- | --- | | [P0420](https://diagxcar.com/codes/p0420) | Catalyst System Efficiency Below Threshold (Bank 1) | Drive to a shop this week | $150-$2,800 | | [P0300](https://diagxcar.com/codes/p0300) | Random/Multiple Cylinder Misfire Detected | Drive to a shop this week | $100-$2,000 | | [P0171](https://diagxcar.com/codes/p0171) | System Too Lean (Bank 1) | Drive to a shop this week | $15-$1,300 | | [P0455](https://diagxcar.com/codes/p0455) | Evaporative Emission System Leak Detected (large leak) | Safe to drive | $20-$600 | | [P0128](https://diagxcar.com/codes/p0128) | Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) | Safe to drive | $50-$600 | | [P0442](https://diagxcar.com/codes/p0442) | Evaporative Emission System Leak Detected (small leak) | Safe to drive | $20-$600 | | [P0401](https://diagxcar.com/codes/p0401) | Exhaust Gas Recirculation "A" Flow Insufficient Detected | Safe to drive | $150-$800 | | [P0301](https://diagxcar.com/codes/p0301) | Cylinder 1 Misfire Detected | Drive to a shop this week | $100-$1,500 | ## What does it cost? - [Brake pad replacement cost](https://diagxcar.com/cost/brake-pad-replacement): $150-$400 - [Catalytic converter replacement cost](https://diagxcar.com/cost/catalytic-converter-replacement): $1,000-$3,000 - [Alternator replacement cost](https://diagxcar.com/cost/alternator-replacement): $450-$1,100 - [Car battery replacement cost](https://diagxcar.com/cost/car-battery-replacement): $150-$450 - [Spark plug replacement cost](https://diagxcar.com/cost/spark-plug-replacement): $120-$450 - [Timing belt replacement cost](https://diagxcar.com/cost/timing-belt-replacement): $500-$1,300 ## How long does it last? - [How long do alternators last?](https://diagxcar.com/how-long/alternator): 7-10 years - [How long do brake pads last?](https://diagxcar.com/how-long/brake-pads): 30,000-70,000 miles - [How long do brake rotors last?](https://diagxcar.com/how-long/brake-rotors): 30,000-70,000 miles - [How long do car batteries last?](https://diagxcar.com/how-long/car-battery): 3-5 years - [How long do catalytic converters last?](https://diagxcar.com/how-long/catalytic-converter): 10 years or more - [How long does a fuel pump last?](https://diagxcar.com/how-long/fuel-pump): 100,000+ miles ## Symptoms - [Why is my car AC blowing warm air?](https://diagxcar.com/symptoms/ac-blowing-warm-air) - [Why is blue smoke coming from my exhaust?](https://diagxcar.com/symptoms/blue-smoke-from-exhaust) - [Why do my brakes make a grinding noise?](https://diagxcar.com/symptoms/brake-grinding-noise) - [Why does my brake pedal go to the floor?](https://diagxcar.com/symptoms/brake-pedal-goes-to-floor) - [Why does my car smell like something is burning?](https://diagxcar.com/symptoms/burning-smell-from-car) - [Why does my car battery keep dying?](https://diagxcar.com/symptoms/car-battery-keeps-dying) - [Why does my car click but not start?](https://diagxcar.com/symptoms/car-clicks-but-wont-start) - [Why does my car crank but not start?](https://diagxcar.com/symptoms/car-cranks-but-wont-start) - [Why does my car hesitate when I accelerate?](https://diagxcar.com/symptoms/car-hesitates-when-accelerating) - [Why does my car jerk when I accelerate?](https://diagxcar.com/symptoms/car-jerks-when-accelerating) - [Why is my car leaking coolant?](https://diagxcar.com/symptoms/car-leaking-coolant) - [Why is my car leaking transmission fluid?](https://diagxcar.com/symptoms/car-leaking-transmission-fluid) ## Makes - [Acura](https://diagxcar.com/makes/acura) - [Audi](https://diagxcar.com/makes/audi) - [BMW](https://diagxcar.com/makes/bmw) - [Buick](https://diagxcar.com/makes/buick) - [Cadillac](https://diagxcar.com/makes/cadillac) - [Chevrolet](https://diagxcar.com/makes/chevrolet) - [Chrysler](https://diagxcar.com/makes/chrysler) - [Dodge](https://diagxcar.com/makes/dodge) - [Ford](https://diagxcar.com/makes/ford) - [GMC](https://diagxcar.com/makes/gmc) - [Genesis](https://diagxcar.com/makes/genesis) - [Honda](https://diagxcar.com/makes/honda) - [Hyundai](https://diagxcar.com/makes/hyundai) - [Infiniti](https://diagxcar.com/makes/infiniti) - [Jaguar](https://diagxcar.com/makes/jaguar) - [Jeep](https://diagxcar.com/makes/jeep) - [Kia](https://diagxcar.com/makes/kia) - [Land Rover](https://diagxcar.com/makes/land-rover) - [Lexus](https://diagxcar.com/makes/lexus) - [Lincoln](https://diagxcar.com/makes/lincoln) - [Mazda](https://diagxcar.com/makes/mazda) - [Mercedes-Benz](https://diagxcar.com/makes/mercedes-benz) - [Mini](https://diagxcar.com/makes/mini) - [Mitsubishi](https://diagxcar.com/makes/mitsubishi) - [Nissan](https://diagxcar.com/makes/nissan) - [Porsche](https://diagxcar.com/makes/porsche) - [Subaru](https://diagxcar.com/makes/subaru) - [Tesla](https://diagxcar.com/makes/tesla) - [Toyota](https://diagxcar.com/makes/toyota) - [Volkswagen](https://diagxcar.com/makes/volkswagen) - [Volvo](https://diagxcar.com/makes/volvo) ## Tools - [Tire size calculator](https://diagxcar.com/tools/tire-size-calculator) - [Tire size decoder](https://diagxcar.com/tools/tire-size-decoder) - [Tire sizes in inches](https://diagxcar.com/tools/tire-size) --- General information, not a substitute for a qualified mechanic.