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Joined: Sep 2009
Posts: 110
Enthusiast
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OP
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Joined: Sep 2009
Posts: 110 |
po150 02 sensor circuit malfunction fault code
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Joined: Aug 2010
Posts: 309
Old Hand
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Old Hand
Joined: Aug 2010
Posts: 309 |
Thats your first stop then, dead O2 sensor, rough running will come from the fuel trim being screwed up, as the O2 sensors give feedback to correct the fuelling.
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OP
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Is there anyway of taking these out and checking as dont fancy spending £180 and not being the problem ?
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Joined: Dec 2003
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Wiki Veteran
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Wiki Veteran
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odd as it sounds you may just need a new battery bud.
Uncertainty or not knowing causes depression, Im happy because I know I'm going to die one day!
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Forum Master
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Forum Master
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You said that yours is a 2.0 Is this the MAF for it, a lot cheaper than £180 if it is. eBay
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Joined: Sep 2009
Posts: 110
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OP
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Going to check battery voltage tomorrow
£180 for 2 lambda sensors had maf off today seems clean and in good condition but you never can tell watching listing anyways cheers
and
Cheers for the recommendation for my peugeot TheDr hope he enjoys the car
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Joined: Jul 2008
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Wiki Master
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Wiki Master
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po150 02 sensor circuit malfunction fault code Sounds pretty conclusive, sometimes its just the connector or even a wire broken off at the sensor end. Very occasionally its just some cr*p on the sensor. If you have pre-cat and post-cat sensors you could try swopping them over, I can't remember which is the more critical one but I would guess the pre-cat. Wouldn't drive it too much like this, it can wreck your cat.
We don't do charity in Germany, we pay taxes. Charity is a failure of governments' responsibilities - Henning Wehn https://ddue.uk
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Joined: Aug 2010
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Old Hand
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Old Hand
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Pre-cat gives the closed-loop reading to the ECU, the post-cat just verifies that the emissions have dropped by a "suitable" amount on passing the cat, this is part of OBD2 standard to ensure catalyst efficiency. Or in english, its a load of chuff. Try the link below for sensors - the post cat "shouldnt" make it run rough, only the pre-cat can do that (in theory, but its an Alfa so anything is possible). -> http://www.lambdapower.co.uk/
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Joined: Jul 2008
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Looks like both lambdas have the same connector and rear has longer lead. So you could try swopping them over but leaving the (new) rear one disconnected (lead won't be long enough) and seeing if it runs smoother. I'd try it if it was mine just to confirm for those prices, but your risk 
We don't do charity in Germany, we pay taxes. Charity is a failure of governments' responsibilities - Henning Wehn https://ddue.uk
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Joined: Dec 2003
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Going to check battery voltage tomorrow
£180 for 2 lambda sensors had maf off today seems clean and in good condition but you never can tell watching listing anyways cheers
and
Cheers for the recommendation for my peugeot TheDr hope he enjoys the car I would, my eml came on last week and the car wouldnt engage vtec (honda civic typeR) Voltage was 12.7 so I knew it was a volt or 2 down, I went down different avenues looking for the fault. Anyway long story short it was the battry and the cars been fine since.
Last edited by Sanchez; 30th Dec 2010 12:49am.
Uncertainty or not knowing causes depression, Im happy because I know I'm going to die one day!
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Joined: Aug 2010
Posts: 309
Old Hand
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Old Hand
Joined: Aug 2010
Posts: 309 |
Going to check battery voltage tomorrow
£180 for 2 lambda sensors had maf off today seems clean and in good condition but you never can tell watching listing anyways cheers
and
Cheers for the recommendation for my peugeot TheDr hope he enjoys the car I would, my eml came on last week and the car wouldnt engage vtec (honda civic typeR) Voltage was 12.7 so I knew it was a volt or 2 down, I went down different avenues looking for the fault. Anyway long story short it was the battry and the cars been fine since. Having tuned hundreds of Honda's over the years, reluctant VTec engagement should always ring alarm bells, as it usually means low oil pressure. The VTec solenoid is oil pressure operated, so if you have low oil pressure, you get no VTec. Just a word of warning
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Joined: Dec 2003
Posts: 8,019
Wiki Veteran
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Wiki Veteran
Joined: Dec 2003
Posts: 8,019 |
Going to check battery voltage tomorrow
£180 for 2 lambda sensors had maf off today seems clean and in good condition but you never can tell watching listing anyways cheers
and
Cheers for the recommendation for my peugeot TheDr hope he enjoys the car I would, my eml came on last week and the car wouldnt engage vtec (honda civic typeR) Voltage was 12.7 so I knew it was a volt or 2 down, I went down different avenues looking for the fault. Anyway long story short it was the battry and the cars been fine since. I'd just had it serviced with the correct oil and level. I must admit the vtec light does flash on when im in 5th around 7krpm, which I do put down to oil pressure too. I wounder if my pump is on her way out, but yer they are pressure related and it was a strange one. The only lodgical explanation I can think of is the ecu and vtec solonoid needed the full 14V? Having tuned hundreds of Honda's over the years, reluctant VTec engagement should always ring alarm bells, as it usually means low oil pressure. The VTec solenoid is oil pressure operated, so if you have low oil pressure, you get no VTec. Just a word of warning
Uncertainty or not knowing causes depression, Im happy because I know I'm going to die one day!
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Joined: Aug 2010
Posts: 309
Old Hand
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Old Hand
Joined: Aug 2010
Posts: 309 |
I have to say dude, it does sound unlikely, most automotive solenoids fire easily enough from about +10V upwards, still, if the battery has sorted it - then thats all good.
I'm assuming (as you said you have a VTec light) we're talking about a B series engine? Most of my work was on EP3's and DC5's , both powered by the K20A2.
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Joined: Dec 2003
Posts: 8,019
Wiki Veteran
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Wiki Veteran
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Posts: 8,019 |
Its an ep3 k20 block. good to know an expert though, im going through a few probs atm, i'll start a new topic and discuss it there rather than spam up mike cookes thread 
Uncertainty or not knowing causes depression, Im happy because I know I'm going to die one day!
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Joined: Aug 2010
Posts: 309
Old Hand
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Old Hand
Joined: Aug 2010
Posts: 309 |
Oh ok, if you've issues with it - feel free to PM me. I've been involved with K20's in Civics, Integras and transplants into Lotus Elise and Exige S1's and S2's Also fitted my fair share of Jackson superchargers, and a couple of Rotrex centrifugal blowers.
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