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Author Topic: 2.2 with P0170 code  (Read 5533 times)

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Welung666

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Re: 2.2 with P0170 code
« Reply #45 on: 14 April 2009, 12:31:52 »
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Can you swap the pre-and post cat Lambda sensors over (i.e.remove from the exhaust and re-fit)

Quite easily, would I need to get the codes re-read then to show the other sensor at fault?


Ideally yes.

What we are fighting with is that the O2 sensor is not going closed loop although engine coolant temperature looks fine.

Remind me, does it tick over smoothly?

It wasn't until I replaced the manifold gasket and fixed the 1 stud, smooth as a baby's proverbial now. I will say though (not sure whether it's cause I'm used to a proper engine) it feels really underpowered, but once the EML came on it was much more responsive.
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Welung666

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Re: 2.2 with P0170 code
« Reply #46 on: 14 April 2009, 19:53:44 »
Just thought I'd show you a couple of pics of the front lambda sensor (sorry about the quality):-





VX part no. 09 202 577 (12v)

I'll pull the rear one out tomorrow and swop them over then see when Andy can come back over.
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Welung666

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Re: 2.2 with P0170 code
« Reply #47 on: 15 April 2009, 08:42:24 »
So much for me swopping them over today! Bl00dy thunder and lightning here atm :(  :'(
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Welung666

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Re: 2.2 with P0170 code
« Reply #48 on: 21 April 2009, 12:49:01 »
Right....

Front Lambda - 09 202 577
Rear Lambda - 09 202 576

They look identical apart from the cable length. Swopped them over anyway.

Cleared the P0170 code. Ran it until hot and through various rev ranges between tickover (about 800) and 3500. No EML or codes. Once hot left it ticking over for 3 minutes and P0170 came back on again. Turned it off, cleared the code and started back up again. I left it 20 minutes at hot tickover (when the light normally comes on) and it never came back on!! Do you think the lambda will still be reading high on the emissions test at this point?
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Welung666

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Re: 2.2 with P0170 code
« Reply #49 on: 22 April 2009, 20:52:16 »
Flippin' 'eck!!! Only posted yesterday lunchtime and it's already at the bottom of page 4  :o :o :o (well it was ;D) Been out to the local super-scrappy (Saunders Bros. in Stourbridge) and spent 3/4 of an hour digging through a bucket of Lambda sensors! Found another 09 202 576 (long wire) for £15 :y I'll be playing at the weekend now I suppose  ::)
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Welung666

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Re: 2.2 with P0170 code
« Reply #50 on: 27 April 2009, 21:03:04 »
Right last chance before this car goes up in flames and the insurance claim form gets filled in  >:( >:(

Picked up a replacement lambda, swopped it with the post-cat and fired her up. Once up to temp revs drop about 100 rpm and P0170, cleared it, revs return to normal. 30 seconds later exactly the same so removed the spare and replaced the post-cat lambda. Removed pre-cat lambda and replaced with spare. 30 seconds later the revs drop and P0170, cleared it, revs return and same again after 30 seconds later. So in conclusion the chances of me wasting £15 on a lambda sensor is very high. So the only thing left it could be is the cats???

I really wish I hadn't quit smoking now  >:( >:( >:(
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Welung666

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Re: 2.2 with P0170 code
« Reply #51 on: 29 April 2009, 12:09:17 »
Anybody?
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Proz

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Re: 2.2 with P0170 code
« Reply #52 on: 29 April 2009, 14:33:43 »
If its the only thing you hav'nt tried then it must be surely  :-/
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Welung666

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Re: 2.2 with P0170 code
« Reply #53 on: 29 April 2009, 16:23:31 »
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If its the only thing you hav'nt tried then it must be surely  :-/

Was it you that suggested the MAF??? I'm gonna buy a cheap eBay pattern MAF just to see if it could be that. If that doesn't cure it I'll probably break it.
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Proz

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Re: 2.2 with P0170 code
« Reply #54 on: 29 April 2009, 17:30:50 »
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If its the only thing you hav'nt tried then it must be surely  :-/

Was it you that suggested the MAF??? I'm gonna buy a cheap eBay pattern MAF just to see if it could be that. If that doesn't cure it I'll probably break it.

Yeah i got a new one and it cured my P0170 lean , been 2 months now and its not been back .... but my O2 readings didnt look like yours though  :-/
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Welung666

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Re: 2.2 with P0170 code
« Reply #55 on: 29 April 2009, 19:07:19 »
Well Pippin is (hopefully) coming over Friday so I can borrow his for half an hour, see what the codes say then eh  :-/
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Welung666

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Re: 2.2 with P0170 code
« Reply #56 on: 04 May 2009, 12:27:19 »
Right first of all some thank you's.... Pippin for offering to come over with his car, but due to unforeseen circumstances couldn't make it. Thanks to Smegmatt for making it over today with his car :y

Swopped his MAF onto my car, it started first time and no misfire (as before) and then ran it up to temp.

Checked off the codes and got a P0155 (02 sensor bank 2 sensor 1 heater) but ran smooth as a bell as opposed to before. Cleared that code off then came back with P0155 and P0170. Changed the MAF back to the original and the misfire returned along with the P0170 fault. Then had a P0110 (Air Intake Temp Sensor) along with the P0170.

So in conclusion I'm guessing (please correct me if I'm assuming incorrectly Mark) that the MAF is on it's last legs (for the intake temp and misfire) and the pre-cat 02 sensor heater circuit is inoperable????

I got to say I'll be glad to see the back of this car now  >:(
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Iain

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Re: 2.2 with P0170 code
« Reply #57 on: 05 May 2009, 11:14:34 »
Ive just found this thread,and i have to say mine is along the same lines, i cant remember the exact code but it came up as Cat efficiency..
New downpipe fitted,full service...great...

2 hours later it starts to mis-fire badly,plugs it back in and shows EGR valve fault,gets new one fitted and all good,2 days later EML back on!
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mkaminski100

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Re: 2.2 with P0170 code
« Reply #58 on: 18 April 2010, 09:40:37 »
HI
I am just trying to fix my friends car with exactly same problem. P0170 and lean exhaust.
MAF was replaced.
Second lambda replaced.
Spark plugs replaced.
Throttle body was cleaned - some improvement in power and low revs but P0170 still comes back.
It feels like there is a misfire every now and then.
Lamba readings are about 120 and 90mV and constant when on idle. When revved first one is going up a bit, but the second stand still.

O2 sensor is in open loop which worries me a bit.

I could only think of a cat but why would a lambda work in an open mode then?
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