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 Post subject: Engine Light Switched on! After hitting small pot hole
PostPosted: Sun Dec 29, 2013 7:23 am 
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Joined: Tue May 22, 2007 7:56 pm
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Location: Brisbane
Hi Guys,

Wife was driving the swift last week on a road 60km/hr she said she drove over a pot hole and next minute the check engine light switched on! :(

I read on the forums it is related to faulty o2 sensor and should be replaced etc, after getting the car looked into I've been told the mechanics have just reset the error gave it a test drive (10min drive) to see if the light would switch back on..

But it didn't come back so I've been told the o2 sensor is all good! does this sound right? a slight bump in the road caused it to go crazy and report a fault?

They were quoting me around $300 ~ $500 to replace o2 sensor depending on what sensor it is.

They didn't charge me anything to reset the code so that was nice :)

I'm just hoping it doesn't come back, The car is running normally and not using excessive fuel

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 Post subject: Re: Engine Light Switched on! After hitting small pot hole
PostPosted: Sun Dec 29, 2013 9:39 am 
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Joined: Tue May 22, 2007 7:56 pm
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Location: Brisbane
Code from OBD tool,

P0420 bank 1 low threshold, code erased, code did not return

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 Post subject: Re: Engine Light Switched on! After hitting small pot hole
PostPosted: Sun Dec 29, 2013 11:03 am 
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O2 sensors are very common problems in my experience with swifts around 80k to 100k. I have mostly seen o2 heater circuit faults though. You might get lucky and it won't come back on.

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 Post subject: Re: Engine Light Switched on! After hitting small pot hole
PostPosted: Sun Dec 29, 2013 10:07 pm 
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Location: Brisbane
Well car does now have 137,500km :)

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 Post subject: Re: Engine Light Switched on! After hitting small pot hole
PostPosted: Wed Jan 29, 2014 7:58 am 
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Joined: Tue May 22, 2007 7:56 pm
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Location: Brisbane
So exactly almost a month since we got the engine light error cleared it came back this morning!

No bump in the road this time, just idling at a set of traffic lights,

This time around tho I can feel some differences with the light on,

When the car is first started it will rev to 2,000 rpm then back down to <1,000 rpm sits and idles at normal..

I have called the mechanics who originally cleared the error, they've told me to bring it in again and they will look again at it, told me that it might be a loose cable that runs to the o2 sensor, or the sensor will need to be replaced.. :(

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 Post subject: Re: Engine Light Switched on! After hitting small pot hole
PostPosted: Sat May 09, 2015 9:38 am 
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Location: Bunya QLD 4055
We had the same problem and got it cleared but light has not come back on. What was the upshot off your solution?

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 Post subject: Re: Engine Light Switched on! After hitting small pot hole
PostPosted: Sat Jun 20, 2015 3:25 pm 
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Joined: Sun Dec 09, 2007 10:48 pm
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Location: brisbane
I can tell you the problem is related to the catalytic converter having a hole melted in it very common problem my partners car and many others i have worked on have suffered this problem you can replace the sensor but the code will return until you replace the cat.

pic added to show what has happened most exhaust shops won't charge much to inspect.


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 Post subject: Re: Engine Light Switched on! After hitting small pot hole
PostPosted: Sun Jun 28, 2015 7:18 pm 
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Joined: Tue May 22, 2007 7:56 pm
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Location: Brisbane
Thought I might post an update as this was a while ago..

I ended up getting dmwdave who is a member here to install 2 second hand sensors and a second hand cat convertor off a used swift with around 40,000km (wrecking)

Have not had any troubles since :) car is almost at 200,000km now apart from the random hit an run incident in april it's been trouble free! :)

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 Post subject: Re: Engine Light Switched on! After hitting small pot hole
PostPosted: Mon Jul 02, 2018 10:22 pm 
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Location: Victoria
I know this is an old thread, but I also have been getting this CEL for sensors (funnily enough, probably also in the aftermath of a bad pothole) and having already replaced an o2 sensor, am not keen to throw money at the problem much anymore.

Had a mate check/clear the code and its the cat now. My mechanic "flushed" it out back when he did the o2 as a temp thing, but i guess its time to bite the bullet n change it.

Any idea how much an old cat would go for at the wreckers? It sounds like a costly job to get it properly replaced, and read that some options were to just replace the headers and get a bolt on. If its a common problem i kinda don't want the hassle of sourcing another used part down the track it thats typically what happens in terms of faults. Would be nice to weigh up the cost/benefits of my options.

I take pretty good care of my old swift, and intend to keep it going for a long time. Its been good to me these last 11 yrs.


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 Post subject: Re: Engine Light Switched on! After hitting small pot hole
PostPosted: Tue Jul 03, 2018 4:28 pm 
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Location: Napier
Might have been better to start your own thread and reference this one, just saying.

Why not a quote from the exhaust guys? Or are you a welder and want to save on the $$$? Old cats wouldn't be worth it unless you can find a car that has one the right size and has done 50,000kms or less.

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 Post subject: Re: Engine Light Switched on! After hitting small pot hole
PostPosted: Wed Jul 04, 2018 6:03 pm 
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Joined: Sat Jun 17, 2006 10:49 am
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Location: WA
Ask your local muffler shop. Guess would be $150 to fit & weld a new one.
I can weld so a high flow 2" cat is about $70.

Don't waste your time scrounging wreckers.
A failing cat can just drop it's guts once it's hot - especially if you jolt it on a pothole.

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