Oxygen sensors are hooked up in the engine exhaust system in 2 locations; at the exhaust manifold and after the catalytic converter (CAT). In the first location, it is use to give signal to the engine computer so it can control engine fuel mixture. This is done by monitoring the amount of oxygen present in […]

P0174 code means the fuel mixture is lean as indicated by the presence of too much oxygen. This code also is similar to P0171 except it occurs in bank 2 opposite bank 1 for the former code. The common symptoms are lack of power, occasional pinging or detonation, maybe the engine running a little bit […]

Dealing again with your evaporative system which is designed to avoid leakage of gas vapor to the atmosphere, this P0455 code expands this problem further. As you will know, this is accomplish by having a purge solenoid which allows the flow of gas vapor between the tank, fuel canister and throttle body. When this solenoid […]

P0325 code is a malfunction in the knock sensor which is designed to monitor piston knocking when the engine is running. As a matter of fact, this code can be induced by tapping the side of the engine block with a hammer where the knock sensor is located. This code will come if the engine […]

EGR stands for exhaust gas recirculating system which is a means to feed exhaust gas to your intake manifold to reduce emission. In the normal set up, an egr system consist of the egr valve which allows the exhaust gas to flow, an actuator solenoid which controls the vacuum going to the egr valve and […]

This code deals with your evaporative system circuit which controls emission created by escaping fuel vapor in your gas tank. This circuit consists of all the vacuum hoses between the tank and all components used to catch the gas vapor like the canister container used to store gas vapor, solenoids and valves which are used […]

P0420 code denotes a malfunction in the catalytic converter (cat) as designated by the post (downstream) oxygen sensor. As in many cases like this, it is a good idea to measure the voltage oscillation of the oxygen sensors between the front and the back oxygen sensors. At the front (usually located at the exhaust manifold), […]

This code means a lean fuel mixture condition detected by too much presence of oxygen in your exhaust. This is monitored by your oxygen sensor mounted in your exhaust manifold. This is also similar to P0174 fault code. This fault code can be caused by dirty mass sensor wiring element contaminated by the presence of […]

On some occasion, if you have a mass sensor code and you try to service the mass sensor, the fault code could be fixed and the engine light could go away. What happen if the servicing does not work? Here is a quick way you can check it using your DVOM voltage meter:
Using a wiring […]

A lot of times when you scanned an intermittent oxygen sensor fault code, you will be stumped because after you changed the oxygen sensor, the code still remains. Then you give up and surrender the troubleshooting problem to a garage. This is of course will cause you more expenses and waste of your time. However, […]