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Technical (156)
 Alfa Romeo forum : Technical (156)
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Kanoxia
Junior Alfisti
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Posted: 02 July 2010 at 17:28 | IP Logged Quote Kanoxia

Got my car back, running 100% better now I have a new front pipe fitted and new o2 sensor.

Car has fault code P0340 Cylinder 1 Reference Sensor Circuit. The fault was cleared to check it wasn't anything to do with the exhaust/o2 sensor being changed but it came back instantly.

What are the possible causes of this, and without going down the removing cambelt to get at sensor road is there anything else I can check which might be at fault? I read the other thread on this but I didn't get much info from it.
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gazza82
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Posted: 02 July 2010 at 17:31 | IP Logged Quote gazza82

My OBD codes shows it as P0340 Camshaft Position Sensor Circuit Malfunction

Check the sensor connections etc. To change it you will need to take the cambelt etc off though.


Edited by gazza82 on 02 July 2010 at 17:33


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Gazza
'98 2.0 TSpark SP 2, sunroof, hi-spoiler, Alfa Rosso, V6 intake, clear repeaters, Zeatec undertray.

If you're driving on the edge, you're leaving too much room!
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Kanoxia
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Posted: 02 July 2010 at 17:32 | IP Logged Quote Kanoxia

This code was read from a Snapon Diagnostic computer

I should point out my car is a 156 2.0
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gazza82
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Posted: 02 July 2010 at 18:44 | IP Logged Quote gazza82

The problem is the early TS diagnostic wasn't to any standard except Fiat's so the snapon may not be giving the right description. If you only have one lambda sensor then it is an early model.

You really need to use Alfadiag or FiatECUScan (with a VAGCOM KKL interface cable) or take it to a dealer or specialist with Examiner.

P0340 under Alfadiag is Cam Position Sensor: Short circuit to VBatt/Opencircuit .. I know because I get that one occasionally ... and the engine mgmt light (looks like an injector) comes on.





Edited by gazza82 on 02 July 2010 at 18:48


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Gazza
'98 2.0 TSpark SP 2, sunroof, hi-spoiler, Alfa Rosso, V6 intake, clear repeaters, Zeatec undertray.

If you're driving on the edge, you're leaving too much room!
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Kanoxia
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Posted: 02 July 2010 at 20:07 | IP Logged Quote Kanoxia

Ok, if it is that how do I fix it?
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gazza82
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Posted: 03 July 2010 at 18:28 | IP Logged Quote gazza82

Most obvious answer is replace it ... but that will involve removing the cambelt and I think the cam gears ...

You could make sure all the connections on the back of the engine, over the inlet manifold are tight and clean. There's a pale blue one, black, brown (lambda), ....



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Gazza
'98 2.0 TSpark SP 2, sunroof, hi-spoiler, Alfa Rosso, V6 intake, clear repeaters, Zeatec undertray.

If you're driving on the edge, you're leaving too much room!
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bobby
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Posted: 03 July 2010 at 23:51 | IP Logged Quote bobby

I have had this code on my TS for about a year! Mine isn't worth doing the belts again, which are only 2 yrs and 20 k old so I just left it . Done no harm so far, tho she feels like
Lost ( just a few) horses. Hopefully replacing her next month!

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Kanoxia
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Posted: 04 July 2010 at 07:53 | IP Logged Quote Kanoxia

Would this cause me to fail my MOT? Not sure I can afford the huge labour costs this will no doubt entail after being ripped off on my exhaust
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bobby
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Posted: 04 July 2010 at 09:34 | IP Logged Quote bobby

No effect on MOT mate. How she drives is all can be effected. If like me your belts are ok and she drives ok I would leave it.

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Kanoxia
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Posted: 04 July 2010 at 14:40 | IP Logged Quote Kanoxia

Cool, thanks for that. Saved me a major headache
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