Q: I have been using 20W40 engine oil out of ignorant for two years now on my Passat cc 2009 model But I found out that the right oil

I would not recommend adding octane booster to regular gasoline to try to make premium. The octane booster has various effectiveness and may or may not improve the octane (https://www.yourmechanic.com/article/which-type-octane-of-gas-is-recommended-for-my-car) from 87 to 91+. Octane booster is usually used in...

Hello. This is a common problem on this generation of Impala. Some solutions I have seen work with this problem are replacing the mass air flow sensor (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement) or crankshaft position sensor (https://www.yourmechanic.com/services/crankshaft-position-sensor-replacement). The mass air flow sensor relays to...

The illumination of the check engine light means that diagnostic trouble codes were set during this incident. The codes are probably "related" to the knocking noise. If there was a mechanical failure in the engine, these codes could have simply...

Hi there. Unfortunately, this sounds like an internal failure of the transmission. One or more of the components inside the transmission that is required to engage the forward gears has failed. The transmission will require replacement or a rebuild. Unfortunately,...

Hi there. P0405 is an OBD-II generic code (https://www.yourmechanic.com/article/p0405-obd-ii-trouble-code-exhaust-gas-recirculation-sensor-circuit-a-low-by-jay-safford) that the engine control module (ECM) detected the engine exhaust gas recirculation (EGR) sensor has went below its specification range. A short to ground of the sensor input to the ECM....

Hello, What you are describing may be a result of a faulty speed sensor, potentially low transmission fluid (https://www.yourmechanic.com/services/transmission-fluid-service) or a even a faulty transmission control solenoid. As your vehicle travels down the road, the computer analyzes data being sent...

Hi there - your symptoms suggest a problem with the transmission since they only appear when the vehicle is in gear (https://www.yourmechanic.com/article/how-to-troubleshoot-a-car-that-makes-a-whining-noise-when-in-gear-by-john-hege). First task is to check the transmission fluid - you are looking for "clear" red fluid and no...

If the a/c compressor is binding or wobbling from bad compressor bearings then replacing the belt will not fix anything and the compressor may just tear up the new belt.

Hey Brandon. Thanks for sending in the question yesterday. There are two reasons why this tends to happen after replacing a throttle body. Either there is a vacuum line that has come loose (which is rather common), or the idle...