P0421 Lexus Auto Trouble Code
Parts or components should not be replaced with reference to only a P0421 Lexus DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.
When you fill your car with gas, the vapors in the tank get forced into a canister filled with activated charcoal. Also, on a hot day as the gas heats up and vaporizes, those same vapors push into the canister where they're stored. But the charcoal can only hold so much vapor. At some point it has to be emptied. The emptying process is called canister purge.
P0421 Lexus Possible Solution:
Air Conditioning Pressure Sensor (ACP) Insufficient Pressure Change Each time the A/C clutch engages, the PCM is looking for a pressure change in the refrigerant. If the change in pressure is outside of the calibration the DTC will set. A/C system mechanical failure Open ACP or VREF circuit A/C sensor damaged A/C system electrical failure A/C clutch always engaged Verify A/C system function, including refrigerant charge.
P0421 Lexus Description For All Models :
- Lexus Daytona
- Lexus Es
- Lexus Flv
- Lexus Gs
- Lexus Gx
- Lexus Is
- Lexus Is200
- Lexus Is220
- Lexus Is250
- Lexus Is300
- Lexus Lf
- Lexus Ls
- Lexus Ls 300
- Lexus Ls 350
- Lexus Lx
- Lexus Minority Report
- Lexus Rx
- Lexus Rx 300
- Lexus Rx400h
- Lexus Rx450h
- Lexus Sc
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P0421 Lexus Trouble Repair :
If your vehicle failed a P0421 Lexus test and the P0421 Lexus Check Engine Light is NOT on, chances are you have a problem with the OBDII system, a burned out MIL lamp, or a faulty catalytic converter. The converter is essentially an afterburner that cleans up the exhaust after it exits the engine. The OBDII system uses a ownstream oxygen sensor to monitor the efficiency of the converter, and it should detect a drop in converter efficiency if the converter has been contaminated or is failing (ignition misfiring, leaky exhaust valves, and oil burning can all damage the converter). What you want to look any conditions that might cause ignition misfire, an overly rich or lean fuel condition, or loss of compression. Use your OBD Express DIY to look at the oxygen sensor outputs, coolant temperature, airflow, calculated engine load, and inlet air temperature. |
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