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How do I turn off the maint req'red light? What is the code: P0420 & P0401 ?

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A scanner can clear the codes. Autozone or Advance will scan for free. As for the codes, you can review codes and causes here: http://alflash.com.ua/OBDII/EOBDcodes.pdf

Posted on Sep 10, 2010

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Why does my 2002 Acura Rl have a error code of P0401


P0420-catatytic convertor failure Replace convertor
P0401- EGR flow insufficient-Clean EGR passages
P0730-Faulty transmission shift control-Get diagnosed

Jun 01, 2014 | 2002 Acura RL 3.5

1 Answer

Maint req'd light was lit and do not know what is and how to fix


The '91 & newer models turned the maint, req. light on by a timer in the ECU & the ECU turns it on around 120k miles based on a timer and requires a dealer or shop visit to be reset.But it isnt going to hurt anything by being on.

Mar 29, 2012 | 1991 Jeep Wrangler

1 Answer

My engine light is on so i took an OBD reading and it showed the error codes P0401, P0420 and P0133. What do I need to fix?


P0401 is EGR valve, low circulation detected.
P0420 Catalyst system.
P0133 is O2 sensor bank 1 sensor 1.
All these codes are emissions related, so i would start with the EGR valve, it's probably clogged with carbon. The catalytic converter could be also, check that for excessive backpressure. The oxygen sensor can be tested, replace if needed. Good luck, i hope this helps.

Jul 29, 2011 | 2000 Honda Prelude

1 Answer

Maint. req. light blinks 10 times after start up?


When a Honda Maint Req light blinks, but then stops, it is telling you to change your oil. If you don't change it, eventually, the maint req light will stay on. Here is how you reset the maint req light: 1) Turn they key to the II position
2) Turn the key to the off position, and push and hold in the odometer reset button
3) Turn they key back to the II position, while still holding the odometer button.
4) After about 10-15 seconds, the light should go off.

If that doesn't work, try it this way: p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Verdana}

With the igniition off, press and hold the odometer button, turn the key to the "on" position, but do not start the car. Keep the odometer button down until the oil light begins and ends flashing. Turn the key off, and then start car to see if it worked or not.

May 08, 2011 | 2005 Honda Element

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Mil bulb not work .conector damage.mil commando on code # p0420.p0401.p0740


P0420 = catalyst system efficiency below threshold (bank 1).

P0401 = Exhaust gas recirculation-insufficient flow detected

P0740 = Torque converter clutch, circuit malfunction.

Mar 07, 2011 | Honda Odyssey Cars & Trucks

1 Answer

I have a Honda 2000 Odyssesy and the maintenance required light comes on and stays on. We recently changed the oil and filter. I do not notice any problems with the runnning of the vehicle. An auto part...


The maint req. light is a mileage counter. It will turn on every 7500 miles after it has been turned off because that is the factory recommended oil change interval. To turn off the light: with key off, push and hold the trip odometer reset button in. While still holding in the button, turn the key to on but not start. Continue holding the button in until the maint. req. light goes out. Turn key to off.

Code P1456: Evaporative Emission (EVAP) Control System leakage.
Code P0740: Transmission lock up control system.

the first code can be caused by a loose or non-factory fuel cap or a leak.
The second code indicates the transmission torque converter lock-up solenoid could be faulty.

Clear the codes and drive normally for several days. See if the Check Engine light comes on again. If so, have the codes read out and prepare for some repairs. If the light stays off, you had intermittent faults which occur from time to time and nothing is probably wrong.

Feb 24, 2011 | 2000 Honda Odyssey

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FAILED EMISSIONS TEST P0401&P0420 CHECK ENGINE LIGHT RESETED MANY TIMES WHEN CUT OFF ENGINE LIGHT COMES BACK ON AFTER 5-6 MILES. I HAVE REPLACED EGR VALVE .STILL WA\ONT PASS INSPECTION. WHATS NEXT?


P0401 indicates that the Exhaust Gas Recirculation Flow Insufficient Detected. This can be because EGR is faulty . As you have replaced this then the problem must be with the vacuum line . EGR valve vacuum line which can be broken or blocked. The vacumn ine must bbe checked for leaks or any blocks using an vacumn pump connected the line.

P0420 indicates that the down stream oxygen sensor reading is not steady and it is connected with the code P0401.

Jan 05, 2011 | 2001 Toyota Camry

1 Answer

Maint req


try this with key off push and hold the trip re-set now turn key to on position. I have a toyota and this works for it. This may or may not work for honda

Jun 24, 2010 | 2001 Honda Civic

1 Answer

2007 toyota corolla. 6 flashes of the "maint req"


That warning light usually only service (oil change) reminder.

Jun 15, 2010 | Cars & Trucks

2 Answers

P0401,P 0420, CODE IN HONDA ODYSEY


P0401- Bad EGR valve
P0420- Most likely cause is a bad O2 sensor(s) at the catalytic converter

Sep 08, 2009 | 2001 Honda Accord

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