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Topic: scan code diagnosis (Read 2221 times) |
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leewar
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scan code diagnosis
« on: Jul 6th, 2011, 3:51pm » |
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Hi Guys, I had a scan done by pegasus on the March meet and these were the results:
1) P0141 O2 sensor heater circuit malfunction (Bank 1 sensor 2)
2) P0402 EGR flow excessive at idle.
3) P1406 Differential pressure feedback elctronic
sensor circuit downstream hose.
Then Rod kindly lent me his handheld scanner and these are the results as of today:
1) P0113 IAT sensor 1 circuit high input
2) P0141 (as in first scan)
3) P0402 (as in first scan)
4) P0171 System too lean Bank 1
I would appreciate if someone could let me know what this means to the running of the car and what needs to be done, if anything, to rectify the problem. Cheers Lee
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Dave2302
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2006 Mercedes S55 AMG, Retired Barefoot Waterskier
Posts: 1119
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Re: scan code diagnosis
« Reply #1 on: Jul 7th, 2011, 2:47pm » |
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Hi Lee,
change the lambda first and check its earth and live feeds, then once Lambda codes have gone you should get rid of the Lean code, after that see if the IAT sensor is still showing a fault if so check wiring / replace it 
Cheers Dave
ps IAT = Inlet Air Temperature sender
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Dave "The 'ol Bear" ex Footer !
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leewar
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Re: scan code diagnosis
« Reply #2 on: Jul 7th, 2011, 9:50pm » |
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Dave , I have already changed the top lambda when I had to replace the cat. Should I change the lower one? I didn't think that one would give the reading? IAT-on top of the butterfly valve block? Lee
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leewar
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Re: scan code diagnosis
« Reply #3 on: Jul 7th, 2011, 10:25pm » |
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Sorry Dave, IAT-I meant on the side of the engine block. 
P0141 is the lower sensor is it not 
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leewar
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Re: scan code diagnosis
« Reply #5 on: Jul 7th, 2011, 11:36pm » |
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Dave(Tompion)( A lot of Daves on here ) do you mean the one that is underneath on the trunking with the plug on it?
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Simmo
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Re: scan code diagnosis
« Reply #6 on: Jul 8th, 2011, 7:13am » |
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Lee, from his description of the location I'm sure that's what he means. That is the inlet air temperature sensor. The one you referred to in your second post is the Inlet Air Control. IAC.
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Dave2302
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2006 Mercedes S55 AMG, Retired Barefoot Waterskier
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Re: scan code diagnosis
« Reply #7 on: Jul 8th, 2011, 5:32pm » |
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Hi Lee,
Yes, lower (Post Cat) Lambda sensor.
The guys are quite right, the valve on the throttle block is IAC, the one that fits in the trunking is IAT, and that's the one the code refers to
HTH Dave
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Dave "The 'ol Bear" ex Footer !
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Mike H
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Renault Clio
Posts: 2594
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Re: scan code diagnosis
« Reply #8 on: Jul 14th, 2011, 1:54pm » |
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What's up wih EGR, stuck open?
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Mike H
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leewar
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Re: scan code diagnosis
« Reply #9 on: Jul 14th, 2011, 7:32pm » |
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That's what I thought Mike ?? Replace
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Dave2302
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2006 Mercedes S55 AMG, Retired Barefoot Waterskier
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Re: scan code diagnosis
« Reply #10 on: Jul 14th, 2011, 7:42pm » |
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Lee,
Beware of that, (EGR)...........
May be a red herring, or old un cleared code as it didn't come back on the second scan, don't chuck dosh away 
HTH Dave
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Dave "The 'ol Bear" ex Footer !
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leewar
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Re: scan code diagnosis
« Reply #11 on: Jul 14th, 2011, 7:45pm » |
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Dave. Did do the egr test that Tompion suggested and it worked perfectly. Lee
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leewar
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Re: scan code diagnosis
« Reply #12 on: Jul 14th, 2011, 8:04pm » |
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Dave, Just did scan and the only code showing is P0402-egr flow excessive at idle. Lee
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Tompion
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1997 2.3 Ultima estate.
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Re: scan code diagnosis
« Reply #13 on: Jul 14th, 2011, 8:21pm » |
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A Google search shows a faulty DPFE can cause this, so try swapping that if you have a spare.
Details of the DPFE here:
http://www.fordscorpio.co.uk/egrsensors.htm
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leewar
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Re: scan code diagnosis
« Reply #14 on: Jul 14th, 2011, 8:42pm » |
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Tompion, I have a spare DPFE from my old car. Will swap and see what happens, hopefully tomorrow. Cheers Lee
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Tompion
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1997 2.3 Ultima estate.
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Re: scan code diagnosis
« Reply #15 on: Jul 14th, 2011, 8:49pm » |
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Hi Lee
Have a read through this:
http://www.fordscorpio.co.uk/egrmonitor.htm
“Note: P0401 may also be generated for a hose off error, or if the DPFE sensor is failing because its voltage will not match the expected response stored in the PCM.
An open in the VREF wire also causes a P0401 since the voltage does not match the expected response.”
As with a lot of sensors the PCM doesn’t actually know if the EGR flow or whatever is correct, it just relies on the sensor giving it the right information.
The wires to the DPFE are in quite a hot spot so check their condition.
Dave
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ABS multiplug wheel sensor pins MK IV or MK 20
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leewar
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Re: scan code diagnosis
« Reply #16 on: Jul 14th, 2011, 9:06pm » |
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Will check the wiring Dave. As you know from previous threads, I have changed the hoses as they kept blowing off and now stay on. DPFE will be next. Cheers Lee
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Mike H
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Renault Clio
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Re: scan code diagnosis
« Reply #17 on: Jul 15th, 2011, 3:20pm » |
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EGR can be cleaned, my mechanic mate used to take it off and soak it in something overnight, not sure what, something that gets soot off and un-gums things I imagine. Carb cleaner?
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Mike H
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Dave2302
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2006 Mercedes S55 AMG, Retired Barefoot Waterskier
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Re: scan code diagnosis
« Reply #18 on: Jul 16th, 2011, 9:59am » |
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Lee, yes agree with all the above,
You can if careful get the egr's right apart, then use carb cleaner to get it all as new, after that I always use a little "coppaslip" on all moving parts and reassemble it.
Don't use too much coppaslip though as a dollop dropping down the exhaust can damage some types of Lambda sensor
(some sort of chemical reaction)
HTH Dave
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Dave "The 'ol Bear" ex Footer !
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leewar
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Re: scan code diagnosis
« Reply #19 on: Jul 17th, 2011, 4:27pm » |
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Firstly, I cleared the P0402 code and have replaced the egr this morning and will run the car to work tomorrow and see what happens. Lee
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