Question about 2002 Mitsubishi Lancer

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2002 mitsubishi lancer, alarm code 421.

What are steps in troubleshooting this alarm code of 421

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Djjfkg

Posted on Jul 03, 2008

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What does the code 421 mean


the p0421 code on this vehicle is either caused by a bad catalytic converter or an oxygen sensor. your mechanic has a scan tool that he can verify if the converter is faulty by comparing the rear o2 sensor to the front sensor. If the rear o2 sensor's voltage is switching from rich to lean (01-1.0v) similar to the front's, then, it's a bad converter. The rear o2 sensor should keep a steady voltage reading. Have him do this test while at cruising speeds. good luck

Feb 28, 2014 | 2003 Mazda MPV

1 Answer

2002 jeep grand cherokee , alarm won't work ,near side mirror does'nt operate , near side windows don't work ,no central locking.


My Car Alarm Won't Work By HilaryPost, eHow Contributor updated: October 10, 2010 car-alarm-won_t-work-200x200.jpg Troubleshooting a car alarm problem doesn't have to be hard. Fotolia.com">car keys image by bright from Fotolia.com

Troubleshooting a car alarm is relatively easy. You don't even need any tools or manuals to figure out what's wrong. Though car alarms are meant to protect the safety of your car, they can sometimes provide problems of their own. With these simple steps, you can find out what the issue is and attempt to fix it. Common car alarm issues include: your alarm not working, your alarm going off at inappropriate times and your alarm failing to activate itself. You can solve your car alarm's problems by following these easy troubleshooting steps.
Difficulty: Moderately Easy Instructions

  1. 1

    Do a routine check of all your car's systems. Sometimes, other parts of the car are causing the problem. Don't assume it's your car alarm before a thorough check. For instance, if you car will not start, there is probably something wrong with your battery or starter.

  2. 2

    Disable your alarm manually. You may have to set the alarm to valet mode while you diagnose the problem. To do this, put the key in the ignition and press down on the push key until the light on the switch stays a solid color.

  3. 3

    Check your sensors. Sometimes your car alarm will go off at inappropriate times if your sensor is too sensitive. Just adjust your settings to fix the problem.

  4. 4

    Turn off or disconnect any other devices you have in your car. Often, radar detectors, GPS devices and cell phones can interfere with your car alarm system. It's



have a good day

Jan 18, 2011 | 2002 Jeep Grand Cherokee

1 Answer

421 code where is the problem


421 is about the o2 sensors but depend on if is bank 1 or 2 or cat problem

Dec 28, 2010 | 2000 Mitsubishi Galant

1 Answer

I cannot locate the valet switch to disengage the alarm.


    Preparing for the Installation
  1. Step 1 Gather materials. You will need scissors or a knife, crimps, solder material, solder gun, test light, drill, screw bit, screws, tie wrap, double-sided mounting tape and a voltmeter.
  2. Step 2 Read the installation manual that comes with the alarm. Make sure you understand what the instruction manual says. If you purchased the alarm from an automotive store, you can always ask them some basic questions to help you get started.
  3. Step 3 Call the tech support number for manufacturer of the alarm and tell the tech advisor what kind of car you have. Ask what kind of locking system your car uses and what color wire to connect to in order to interface the lock/unlock feature of your alarm,
  4. Step 4 Ask the advisor how to hook up the relay for the door lock feature, what color wire to connect to for the starter disable feature, and how to hook up the relay.
  5. Step 5 Ask how to set up the voltmeter to test the door lock wires.
  6. Step 6 Ask how to access the factory door triggers.
  7. Step 7 Determine where you intend to place the components by referring to the installation manual.
  8. The Installation
  9. Step 1 Mount the siren to a solid metal surface under the hood. Point the horn of the siren down toward the ground so that moisture cannot collect inside it. Drill a hole through a rubber grommet in the firewall of the car and feed the siren's wire through that hole into the passenger compartment of the car.
  10. Step 2 Connect the alarm's power wire directly to the car's battery. Feed the wire through the rubber grommet on the firewall and into the passenger compartment of the car.
  11. Step 3 Put a fuse on the power wire next to the battery. Check the installation manual for the fuse size.
  12. Step 4 Mount the shock sensor as described in the manual.
  13. Step 5 Drill a hole in the dash where you intend to place the LED status indicator. Feed the LED's wire through that hole and place the double-sided mounting tape to the back of the LED and place it over the hole in the dash.
  14. Step 6 Locate the wires that work the car's power door locks.
  15. Step 7 Connect the door-lock relay to the lock/unlock wires and connect the alarm wire to the relay in the manner described by the tech advisor.
  16. Step 8 Using the advice of the tech advisor, locate the wire that works the courtesy light if the alarm has current sensing.
  17. Step 9 Connect the current sensing line from the alarm to the courtesy light wire.
  18. Step 10 Locate the factory door triggers if the alarm does not have current or voltage sensing.
  19. Step 11 Connect the factory door trigger to the alarm.
  20. Step 12 Find the starter wire on the steering column some inches below the starter switch. Cut the line and connect the starter disable relay. Connect the starter disable wire from the alarm to the relay.
  21. Step 13 Mount the valet switch somewhere under the dash.
  22. Step 14 Connect all the wires to the proper inputs and outputs of the alarm module.
  23. Step 15 Mount the module to a sturdy surface under the dash using the drill, screw bit and screws.
  24. Step 16 Use the tie wraps to secure the wires of the harness and stuff it back under the dash.
  25. Step 17 Arm the alarm and test its performance.

Jun 01, 2010 | 1998 Ford Taurus

3 Answers

Have a 2001 RAV4. Tried to unlock car with key on Passenger side. Activated Alarm. Forgot how to deactivate alarm


go around to the drivers door and use the key to lock and then unlock the door, or use the remote to unlock the car. if that doesn't work u have a problem in the security system and will need the system scanned.

Mar 19, 2010 | Toyota RAV4 Cars & Trucks

1 Answer

2001 mitsubishi galant,2.4L eng. Getting DTC 421. Is this code related to the catalytic converter? Check eng. light always on, also DTC 302 showing.


DTC code P0421 is the O2 sensor that indicates a an issue with the Catalytic Converter. Replace the O2 sensor to the Catalytic Converter "the one after Converter" It's common for the sensor to fail and you can pick one up from Auto Zone and they will have the step by step instructions to replacing the O2 sensor. 
DTC code P0302 Indicates a misfire on cylinder #2. Address the spark plug, spark plug wire, and injector. Look for any damages and try running some fuel injector cleaner through the fuel system to clean out the injectors. 
Good luck and hope this helps. 

Aug 11, 2009 | 2001 Mitsubishi Galant

1 Answer

2001 Mitsubishi montero sport check engine light and codes


The Cat code could have cleared itself if the computer doesn't detect a problem anymore. Fix the EGR problem as it is still active.

May 28, 2009 | 2001 Mitsubishi Montero Sport 4WD

1 Answer

Bmw e36 1996 318is


If ews2 alarm is fitted it need to be reset by computer. Any tampering will set it into protectction mode. Had similar problem. You can try the following but if it does not work get someonr with diagnostic computer. PREPARATION 1. Close all doors, trunk, hood and sunroof. 2. The security system must be in 'disarm' mode. The key must be removed from the ignition key slot. ENTER CODE LEARNING MODE 3. Open trunk and leave it opened. 4. Open the drivers door and sit in the drivers seat. 5. Close the drivers door. 6. Cycle the ignition switch 5 times between the 'OFF' position and position 2,(ignition 'ON', all dash warning lamps will illuminate). The red status LED will illuminate continuously, and the siren will 'chirp' once, to indicate that the code-learning mode has been initiated. ?Do No start the engine.? The Ignition switch cycling in step #6 must be performed within 10 seconds. The sequence in steps #1-#6 must be performed within 45 seconds. REGISTER/DELETE ID CODE(S) 7. Open drivers door, (remain seated in the drivers seat) 8. Close the drivers door. 9. Press and release any button on the remote you wish to register in the system. The status LED will shut off momentarily to indicate that one code has been registered. 10. Repeat steps 7 thru 9 to register the three ID codes. It is possible for the system to memorize a total of 4 different ID codes. As a new code is initialized into the memory, the oldest code is automatically deleted. If you had lost your remotes and wished to delete the lost remote ID codes from the memory, you could initialize the ID codes from a newly purchased replacement transmitter four times thereby deleting the previous ID codes from the system memory. EXITING CODE - LEARNING MODE: 11. Open drivers door, and exit from the vehicle, leaving the door opened. 12. Close trunk. 13. Close drivers door. The LED will turn off and the siren will 'chirp twice. 14. The initialization procedure is now completed; Test all remotes to confirm operation.

Jul 01, 2008 | 1996 BMW 318

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