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The sensor after the first catalyst is the one giving you code P0420 and should be replaced if the catalyst is good and you have no other codes in the system.

IIt looks like you have trouble codes from an import vehicle like an Audi or Mercedes Benz. I cannot decipher these codes without more information like the year make and model of the vehicle. Consider hiring an experienced technician like...

If you are getting spark knock then you may have a bad mass airflow sensor telling the computer you are at or above 10,000 feet above sea level and would run the engine lean. Have the sensor tested. As far...

If your Nissan has detected an issue with your transmission in any way, it will typically trigger a setting from the Engine Control Module (ECM) called "limp mode". Limp mode limits the transmission to only second gear, which keeps your...

To request an exact repair quote please click on "Get a Quote" at YourMechanic's door mirror replacement service page. If you desire to attempt the repair yourself, and your existing mirror is not re-usable (that is the glass cannot be...

Hi, thanks for writing in. Usually when your tire pressure monitoring system has an issue, it is due to one of the sensors in the wheels. If it is not due to one of the sensors in the wheels I...

Hi...yes, that is absolutely possible. If you would please review the slate of services (including all the various diagnostic services) available at this link, simply choose the service that best matches the difficulty you are having. Don't worry if it...

Hi Brianna. Thanks for contacting us tonight. When it's really cold outside and the vehicle does not start for longer than a week, it's common for the battery to be low on cranking amps, which causes the lack of starting...

You will need to have the engine tested to see if the head gasket is blown and allowing engine compression to get into the cooling system and forcing coolant out of the reservoir. A mechanic like one from YourMechanic can...

It sounds like you may have a weak battery, a failing voltage regulator or failing alternator. As you may know, the alternator charges the battery while the engine runs by generating amperage and recharging the battery while the engine turns...

If the previous owner specifically asked you not to, they may have known about an issues the vehicle has when using E85. It may be necessary to visit your local dealer to take a look at the truck to see...

YourMechanic can help you with this. Please request a turn signal circuit malfunction diagnostic and the responding certified mechanic will get this taken care of for you. Using a continuity tester, the mechanic will check the turn signal circuit and...

Hello, I assume you have tried manually unlocking the door at the pull knob or at the knob above the door handle. If all that fails your door lock may be stuck and will require removing the door panel in...

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I would ask for help from a mechanic. Possibly from YourMechanic. They can come to you and diagnose why your car is overheating and recommend what repairs are needed.

Hi there. I would recommend buying the stock vehicle, as the one with an engine replacement can have difficulty passing emissions. This may why it's registered as a "hot rod" in your state. If your vehicle passes emissions, you should...

I'm curious as to what "weight" of oil they put in. Most manufacturers now warn against using anything heavier than 10W30 for oil pressure relief valve (overpressure on cold start) reasons. While this is not common, overpressure due to a...

Hello, thank you for writing in. The warning lights that are illuminating will stand for whatever system is failing or having issues. If all of the warning lights are coming on, then it is very unlikely all of those systems...

The cost of the fuse box may need to be quoted separate from the dealer, if it is available anymore. The labor would need to be quoted by a mechanic after the car has been inspected for additional problems...

Hi There, The knock sensor is a component that creates an internal voltage signal based upon vibrations it detects as a result of detonation internally in the motor which creates a knocking vibration. An engine can ping (or knock) due...

Your vehicle probably has a cold start injector time switch, or comparable means to enrich the mixture on cold start to prevent immediate stalling. That component is subject to failure and I would check that first. To generally rule fuel...

Hello, thanks for writing in about your 2001 Toyota Corola. For an issue like this I recommend that you call Pop-A-Lock or a local locksmith. They can make one for you on the spot. I hope this helps and good...

This vehicle is equipped with a cabin air filter that filters the air coming into passenger compartment. The filter blocks debris, and in time restricts the air flow. It requires replacement at least once a year. Another possibly could be...

Hello. There may be a problem with the electrical system, which includes the battery, starter, and alternator. In addition to the starter relay that you just had replaced, it is possible that the starter itself needs to be replaced. I...

For optimal ring seating, the cylinder should be honed. I understand you can see the old cross hatch but the honing also ensures that any glaze on the cylinder wall is broken. That glaze prevents the new rings from sealing....