Q: i have a po401 code i replace the egr and egr senzior

Brake lights staying on after the pedal is released is usually caused by the brake switch near the pedal being misadjusted or missing altogether. It could also be a short to power on the input side of the circuit. Have...

Although you've replaced the battery, it should still be tested. The battery is the heart of the starting and charging systems. However, with a known good battery, suspect the starter or fuel delivery next. A certified mechanic, such as one...

Hi there, thanks for writing in about your 2003 Geo Tracker. There are numerous potential causes for the problem you are having. It could be anything from a bad spark plug (https://www.yourmechanic.com/services/spark-plugs-replacement) to a failed sensor (https://www.yourmechanic.com/article/how-do-sensors-get-dirty-or-damaged). The only way...

Hi there, thanks for writing in. I've always found that the best way to clean a fuel cell, whether it's diesel or gasoline, is to remove it from the vehicle and flush it with a lot of solvent. The problem...

Hi there. This could be normal operation, but the cooling fans could be starting to have issues. Perform a visual inspection of the cooling fans to make sure when they come on that they operate properly; they should move a...

Hi there: When you use an additive to clear up a problem and it works, it's typically an indication of a dirty fuel injector or throttle body issue as opposed to other mechanical component issues. An additive has cleaning chemicals...

Hi there. White smoke is sometimes an indication of coolant finding it's way into the oil inside the motor. This can be caused by a blown head gasket or shortly after experiencing an overheating issue. It can also be caused...

Hi There, This may be related to a failing power steering pump (https://www.yourmechanic.com/services/power-steering-pump-replacement) or low power steering fluid (https://www.yourmechanic.com/services/power-steering-fluid-service) levels. As you may know, the power steering system uses a pump, normally driven by a belt. The pump supplies pressure...

What you are describing sounds like a wheel bearing (https://www.yourmechanic.com/services/wheel-bearings-replacement) that may be starting to fail. A wheel bearing will usually fail due to pitting or small damage on the surface of the rollers or the bearing race. Both the...