Q: Engine blocked when turning it by hand

There are a lot of reasons a computer controlled car won't stay running unless you have your foot on the gas. Anything from low oil pressure to a weak fuel pump could be the cause. Your particular vehicle, however, is...

Hey there, thanks for writing in about your 2009 Nissan Altima. The downstream O2 sensor is the sensor used for catalyst efficiency. It is not the one in the manifold but the one after the converter. If you need help...

Many common faults will cause your 2006 Infiniti G35 to have no cold or hot air coming from the vents. It is good that you can hear the fan as this is an important step in diagnosis. If the you...

Hi there. If your engine was running just fine and then after sitting for 15 minutes and then all of a sudden the engine will not start up but it cranks, then there could be an issue with the igniter...

Hi there - yes, it is necessary to remove the exhaust manifold and catalytic converter (1 integrated piece) for the front cylinder bank to remove the oil pan and it's gasket (https://www.yourmechanic.com/article/how-to-replace-an-oil-pan-gasket-by-ronny-brown). This is an unfortunate result of the tight...

You have bad transmission internal bearings and broken gears. You need to have a transmission mechanic check the transmission to see if it can be rebuilt or needs to be replaced.

Hi There, This may be a sign of a faulty MAP sensor as the vehicle responds adversely to a load put on the motor (i.e. putting it in gear, turning on AC or engaging the brakes). The Manifold Absolute Pressure...

There are a number of things that can cause poor fuel mileage. A faulty camshaft position sensor (https://www.yourmechanic.com/services/camshaft-position-sensor-replacement) is one of them. The camshaft position sensor is a magnetic sensor that monitors camshaft speed to regulate ignition timing and fuel...

If the fault codes are reading all 4 coils are bad and the codes remain even after replacing the coils, then the problem is elsewhere. It is very rare to have 4 cols fail at once. There can be an...