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Zack

Posted: Thu Jun 20, 2013 7:08 am

Joined: May 19, 2011
Posts: 581
Trade Rating: +4
Location: Northamptonshire

Cheers Engine light came on bout co2

macca1411

Posted: Thu Jun 20, 2013 7:32 am

Joined: Jan 29, 2011
Posts: 6526
Trade Rating: +10
Location: Westhoughton, Lancashire

Could be a lambda sensor not working, catalyst not operating correctly. Could be related to a fuel/air problem. www.p0420.com/


	2003 Aegean Blue (KMF) 1.4 Entice 8 valve (Now sold) - 2006 China Blue (EGE) 1.4 Verve 8 valve

Last edited by macca1411 on Thu Jun 20, 2013 7:36 am; edited 2 times in total

MrZiggerz

Posted: Thu Jun 20, 2013 7:33 am

Joined: Jul 28, 2010
Posts: 1131
Trade Rating: +1
Location: Milton Keynes

A code P0420 may mean that one or more of the following has happened: Leaded fuel was used where unleaded was called for A damaged or failed oxygen sensor (HO2S) Downstream oxygen sensor (HO2S) wiring damaged or connected improperly The engine coolant temperature sensor is not working properly Damaged or leaking exhaust manifold / catalytic converter / muffler / exhaust pipe Retarded spark timing The oxygen sensors in front and behind the converter are reporting too similar of readings Leaking fuel injector or high fuel pressure Cylinder misfire Oil contamination

Read more at: www.obd-codes.com/p0420
Copyright © OBD-Codes.com

^ Literally the first thing on google. Use your common sense.

Edward

Posted: Thu Jun 20, 2013 8:41 am

Joined: Feb 08, 2010
Posts: 7045
Trade Rating: +5
Location: In the garage

That error will have been flagged up by the downstream lambda as it's the one that checks the output from the cat.


	2001 GTi 138, Bilstein Sprint dampers, H&R springs, 21mm Peugeot Sport torsion bars, 22mm rear ARB, Peugeot Sport Group A wishbones, 283mm discs, Goodridge stainless hoses, Maniflow 304 grade 4-2-1 2.5" manifold and system, 200 cell cat, Richard Longman head, 45mm Jenvey throttle bodies, 9.5mm TB spacers, 90mm air horns, Jenvey throttle linkage, Jenvey fuel rail, Aeromotive and Goodridge fuel fittings and braided hose, ITG sausage filter, Radtec custom radiator, Piper Ultimate Road cams, Piper vernier pulleys, Omex 600 ECU. Saxo electric PAS pump, Vibra Technics engine mounts. Samco coolant hoses, TTV steel flywheel, 4.76 final drive ratio, 307 CC 180 ratios. 2019 BMW 530i. 2017 Mercedes C300 convertible.

Zack

Posted: Thu Jun 20, 2013 9:24 am

Joined: May 19, 2011
Posts: 581
Trade Rating: +4
Location: Northamptonshire

Edward wrote:

That error will have been flagged up by the downstream lambda as it's the one that checks the output from the cat.

So it is the 2nd sensor after that cat?

Cheers

Zack

Posted: Thu Jun 20, 2013 9:25 am

Joined: May 19, 2011
Posts: 581
Trade Rating: +4
Location: Northamptonshire

MrZiggerz wrote:

You not think i did do that. so ill just go change all of the above lol.

LloydPug206

Posted: Thu Jun 20, 2013 10:10 am

Joined: Feb 20, 2013
Posts: 28
Trade Rating: 0

Zack wrote:

MrZiggerz wrote:

You not think i did do that. so ill just go change all of the above lol.

Im sorry Zack but Ziggerz does have a point... That is the good old fashioned fault finding where you have to systematically go through the components which could be at fault to understand the root cause of the problem.
It simply isn't always as easy as plugging in a 'nostics unit and straight away knowing the exact part at fault.

E5GDM

Posted: Thu Jun 20, 2013 12:02 pm

Joined: Feb 07, 2010
Posts: 4455
Trade Rating: +1
Location: Essex

You might need a new cat.

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