Heated oxygen sensor circuit malfunction (bank 2, sensor 1) Heated oxygen sensor heater circuit malfunction (bank 1, sensor 2)
Heated oxygen sensor circuit malfunction (bank 1, sensor 2) Heated oxygen sensor heater circuit malfunction (bank 1, sensor 1) Heated oxygen sensor circuit malfunction (bank 1, sensor 1) Insufficient coolant temperature for closed loop fuel control Throttle/pedal position sensor (TPS) range/performance problem Throttle/pedal position sensor (TPS) circuit malfunction Intake Air Temperature (IAT) sensor circuit malfunctionĮngine coolant temperature (ECT) sensor circuit malfunctionĮngine coolant temperature circuit range/performance problem Manifold Absolute Pressure (MAP) sensor malfunction Manifold Absolute Pressure (MAP) sensor circuit malfunction Mass airflow (MAF) circuit range/performance problem Mass airflow (MAF) sensor circuit manfunction Car dealers charge around $50+ for each reading.
#Toyota diagnostic codes idle code#
A reader that gives the text description accompanying the code is around $50. A basic reader to just extract and reset the code is around $30. OBDII code readers have significantly come down in price compared to a few years ago. We don't know of any ODBIII on the horizon. ODBII standards were implemented in 1994 to replace ODBI. To Buy or Not to Buy an OBDII Code Reader The possible cheap solution: mixing 4 ounces of Marvel Mystery Oil with every 10 gallons of fuel may resolve the problem after a few tank fill-ups. The purpose of the EGR valve is to recycle a small amount of engine exhaust back into the air/fuel mixture to keep the exhaust temperature from rising high enough to produce too much of a pollutant called nitrogen oxide. Replacing the EGR valve (which isn't cheap) may not resolve the problem unless the VSV valve is also replaced. Either the EGR (Exhaust Gas Recirculation) valve requires replacement, or the VSV (Vacuum Switching Valve - EVAP system component) isn't working properly. P0401 and P0402: This one can be a little tricky.Here's a possible fix for the P0420 problem. It is all guesswork in the absence of an exhaust analysis tool (like what they have at DMV) to determine the efficiency of the converter. P0420: This may indicate a bad "downstream" (after the catalytic converter) 02 sensor (which monitors the efficiency of the catalytic converter) or it may mean a bad catalytic converter.You can't use the old voltage resistance test to test ignition wires that use the new technology. Since coil packs are expensive, the ignition wires are a good starting point for replacement. Multiple P030X or the "Random Cylinder Misfire" code usually indicate a bad coil pack. In a worst case scenario, the check engine light will blink continuously this indicates the car should be serviced as soon as possible or the catalytic converter will go bad in short order. The wire(s) then rest on the hot valve cover and get slowly destroyed by the heat. I've seen wires go bad when wire clips were broken off during spark plug replacement. P030X: A spark plug or spark plug wire is bad.If that doesn't fix it, then it's probably the VSV valve (part of the EVAP system) attached to the charcoal canister that has gone bad. P044X: Determine if your fuel cap is loose.
The warranty period for most electronic components is 90 days to 1 year. Bosch sensors don't seem to work well in Hondas only last a couple of years with Toyotas. When buying a new 02 or Air/Fuel sensor, get Denso or NGK. And when the combustion exhaust gases containing unburned fuel pass into the catalytic converter, the converter will overheat in the process of continuously burning combustible pollutants. Fuel economy will significantly deteriorate. When the ECM gets a weak or inconsistent signal from the upstream 0 2 sensor (the one before the catalytic conveter), the ECM will send an "enrich fuel" signal command to the fuel injectors so that an overly lean air/fuel mixture won't overheat the engine. Going a few months without replacement runs the risk of destroying the catalytic converter. They usually go bad approaching 80,000 miles. O 2 sensors are wear items and do not last forever.
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