Toyota Previa: P0171 and P0174 Diagnosis

P0171 and P0174 both indicate that there is a lean condition present in your Toyota Previa.  By themselves, these are some of the most common OBD2 codes.   When they appear together, it indicates that the entire engine is running lean. Definition Both of these codes are generic, which means they have the same meaning … Read more

Toyota Previa:  Clutch Slipping → Diagnosis

Your Toyota Previa’s clutch provides a direct connection between the engine and transmission.  Without it, it can’t move at all. This connection requires a tremendous amount of pressure.  This guide is intended to help you determine why your clutch is slipping on the flywheel. Note:  This article is for manual cars only.  Here’s the automatic … Read more

Toyota Previa:  Engine Sputtering (Causes + Diagnosis)

A sputtering engine can indicate a number of problems.  If your Toyota Previa has a sputter, it is most likely going to be caused by bad fuel system, ignition system, MAF sensor, or bad catalytic converter.  Your Previa’s engine is a giant pump.  It pulls in air (where it is measured by the mass airflow … Read more

Toyota Previa:  Brake Pedal Going to Floor Diagnosis

The single most important safety feature in your Toyota Previa is a good set of brakes.  If your brake pedal is going to the floor, it indicates that there is a serious problem in the braking system.  When the pedal goes to the floor, it’s usually caused by a bad master cylinder, leaking brakes, bad … Read more

Toyota Previa:  Hard Shift Diagnosis

One of the most common automatic transmission problems is shifting hard.  If your Toyota Previa has a hard shifting transmission is not only can be uncomfortable to drive, it can be a sign of some serious problems.   Transmission Shifting Hard Diagnosis:  Toyota Previa Here is a list of practical things that most people can … Read more

Toyota Previa:  Warped Rotors → Symptoms & Causes

  Rotors are metal discs that are visible behind the Previa’s wheel. They work together with the calipers and brake pads to slow down your Toyota Previa. Due to braking friction, rotors have to withstand and dissipate a tremendous amount of heat. This causes the rotor surface to be uneven making the brake pedal feel … Read more

Toyota Previa: Bad Motor Mount → Symptoms + Diagnosis

While your Toyota Previa’s engine mounts can last the life of the entire vehicle, it is possible that they will go bad.  Vibration and a clunking sound are the two most noticeable symptoms when driving the vehicle.  There are plenty of visible signs as well. Engine mounts connect the engine to the frame of the … Read more

Toyota Previa:  Bad ECM → Symptoms + Diagnosis

Your Toyota Previa’s ECM (Engine Control Module) is its brain.  Just like a human’s brain, your Previa can’t function without it. It is sometimes referred to as the ECU or PCM.  It’s all the same thing. The ECM controls and directs your entire drivetrain (unless there is a serrate transmission controller). When an ECM starts … Read more