159 V6 Engine Check Light - Alfa Romeo Forum
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(Post Link) post #1 of 7 Old 10-05-11 Thread Starter
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159 V6 Engine Check Light

I have searched the forum for the Engine Light on for the V6 159 (Q4 SW) and no answer and just trying this as a faint hope.
Doing a near-limit speed restriction on way to Knaresborough for parts collection and 8CC and Guilietta CL curiousity when hit a pot hole at speed.
Engine Management Light on immediiately.
It is booked in to local independent service place I used for my 33 and 916 Spider. I have already checked fuses and relays in compartment to right of steering wheel and in engine bay in case of jolt causing fuse or relay displacement - no joy. Also 2 hour battery disconnect.
Any obvious things to check as think it is dislodged sensor/electric causing problem as engine goes up and down on RPM oK with no hesitation and no other observable symptioms. Cannot find ought in forum.
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(Post Link) post #2 of 7 Old 17-05-11 Thread Starter
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Had the Engine Diagnostiocs done and Errors remioved at one of my local independent Alfa mechanics.

Error P2416 O2 Sensor on Bank 1
and P2097 Post Cat Fuel Trim too rich.

The jolt had caused poor connection to momentarily separate causing the O2 sensor to misread causing the Cat richness error too. Sorted.
Diagnostic test and EMU reset £35 (and not the Alfa dealer £87.70+)

Now I move forward with the AD Air Filter (when in stock)
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I have "check engine" light on and P2416 code on my 2.2JTS 2005year.
WHAT CAN THAT BE?

Engine RPM is not clear. I mean, there are vibrations and something like misfirings during ride.
Especially in the morning. Engine starts like an old diesel engine.

After reseting the ECU, "check engine" light goes off for a while, but after some time it returns back with the same fault code.

Here is the photo of it:

http://i306.photobucket.com/albums/n...2062011479.jpg
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(Post Link) post #4 of 7 Old 26-06-11 Thread Starter
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Well it happened again fortnight ago. After driving down bumpy back road got the codes:
- Error P2416 O2 Sensor on Bank 1
- Error P2097 Post Cat Fuel Trim too rich.

Went into my local indie specialist and before we reset the codes we all went hunting for connections and wiring.
And bingo.
The lambda probe connectors front (in the engine bay) and back (under the body behind the plastic cover) on the front bank were connected but the connector locks were not set hence the connectors could move around and if violently disturbed (e.g. bumpy roads or pot holes) momentarily cause a break, and then the errors.
Both connectors cleaned and reconnected with the connector lock properly engaged - so far so good.
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Quote:
Originally Posted by swq4 View Post
Well it happened again fortnight ago. After driving down bumpy back road got the codes:
- Error P2416 O2 Sensor on Bank 1
- Error P2097 Post Cat Fuel Trim too rich.

Went into my local indie specialist and before we reset the codes we all went hunting for connections and wiring.
And bingo.
The lambda probe connectors front (in the engine bay) and back (under the body behind the plastic cover) on the front bank were connected but the connector locks were not set hence the connectors could move around and if violently disturbed (e.g. bumpy roads or pot holes) momentarily cause a break, and then the errors.
Both connectors cleaned and reconnected with the connector lock properly engaged - so far so good.
Congrats!
But I don't understand, what was wrong with the connectors?
How can I test my lambda connection? May be I have the same problem.
Where should I look?
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(Post Link) post #6 of 7 Old 26-06-11 Thread Starter
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All the engine wiring loom connectors on the 159 push fit then there is a connector lock (bit of ali & plastic) that ensuires it does not come apart.
The two lambda connectors on the front bank were pushed in but not locked hence they could wiggle about. And we think used to make momentary disconnects on bumpy roads. This is now not the case.

I dont know how many cats a 2.2JTS has (1 or 2) - the V6 has four (two per cylinder bank).
In either case you need to trace the wiring back from the cat to the connector and check it is locked in. If not disconnect clean with electrical cleaner (dispels any moisture), reconnect and click the lock into place.
Its worth a go as it is the easy fix first approach!
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(Post Link) post #7 of 7 Old 26-06-11 Thread Starter
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Other thought is since it is lumpy in the morning or when cold is check the MAF connector too.
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