P0421 OBD Engine Code Logo   Code #P0421 -
Warm Up Catalyst Efficiency Below Threshold (Bank 1)

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Mitsubishi Montero Sport
Chekc


Na

Hyundai Sonata
code p0421


nothing just searching how to do the job

clear catalyst bank 1 bank 2

Mitsubishi Montero Sport
service light is on


check engine #P0421, P0455

ser my problem is how fix the code p0421 1 know what happen bot I don't know how catalystic it.i get Mitsubishi endeavor 2004

p0421 p0431

Check engine light and emmision light on



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Does your Car Idle Roughly? Reduced Power?

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Other Comments

P0863 Ford F-250 Super Duty
engines check light code PO863


P0841 Stuck in park... 2008 Jeep commander sport/xk 4.7L V8 automatic. Symptoms: Shift lever physically moves when attempting to shift from park to reverse, neutral or drive, there is no mechanical action in transmission. Causes engine RPM to fluctuate between 400-700 RPM for 5-20 seconds then idles at a consistent 600 rpm. I have crawled under the jeep while someone is attempting to shift (from park to reverse, neutral and drive) and watched the mechanical linkage moving on the side of transmission. The only error code that pops on the OBD 2 reader is: p0841 transmission fluid pressure sensor.

P0842 when I start the car and put it drive it takes off normal but when it shifts to the other gear it jumps and is alittle sluggish but it shifts again and goes back to normal again

P0139 Kia Spectra
replaced few parts for code po139 and check engine light pops up same cde po139


P0024 p0024&p0021 & p0300



Other Check Engine Light Codes

P0083   Intake Valve Control Solenoid Circuit High (Bank 2)
P0158   O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)
P0262   Cylinder 1 Injector Circuit High
P0288   Cylinder 10
P0307   Cylinder 7 Misfire Detected
P0382   Glow Plug/Heater Circuit 'B'
P0553   Power Steering Pressure Sensor Circuit High Input
P0863   TCM Communication Circuit
P0885   TCM Power Relay Control Circuit/Open
P0893   Multiple Gears Engaged




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