REading 2006 Sonata check engine light code

  • Thread starter Thread starter Voyager
  • Start date Start date
I think my Chryslers are/were OBD II and they allow reading without the
scan tool.  I think my 84 Chevy is called a "partial" OBD II
implementation.  Maybe the foreign brands are different in this regard.

Long story short.  After being on for just less than two days, the light
went out on its own accord at lunch time on Monday.  Since I already had
an appointment at the dealer for this morning I visited anyway thinking
the code would have been stored.  No code.  I asked what might have
happened and they shrugged and said this just happens now and then.

I've never had an American car light the check engine light and then
have no code found.  Not exactly confidence inspiring...

Matt
Click to expand...

I agree that's a little odd. Normally, trouble codes remain for
longer than that, even after the lamp goes out, unless the battery
went dead or was disconnected.

Most faults require two successive failures to turn the lamp on, and
then three successive test pass results for the lamp to be turned
out.

Certain important faults will set the lamp at the first fault.

If there's only been one fault, the code is stored as "pending" and
will be erased if the next test passes. I suppose it's technically
possible that this was an important fault that only occurred once.

Of course, it's also possible that the technician didn't check all
necessary systems (engine and trans) or for whatever reason decided
the thing to do was to clear whatever the code was and simply deny its
existence since the check engine lamp was on.
 
Well, the light is back on again.  Both times now it came on shortly
after fueling the car.  I'm thinking there may be a connection.  I will
see if it goes out again by itself and then if it comes on the next time
I refuel, I will have something more to tell the dealer tech.

Matt
Click to expand...

I wonder if there's a problem with your fuel sending unit. Can't
remember off the top of my head whether it's monitored by the ECM.
Numerous problems with these in early production '06 Sonatas.
 
Stopped by the dealer today and they read the code, which this time was
there and the light was still on.  I didn't write down the number, but I
believe he said it was a P2167.  It was a "lean" indication and they
suspect the O2 sensor.  I take the car in on Thursday to get it fixed.

Matt
Click to expand...

Okay, skip the sender idea. I'm guessing you have a leaking intake
manifold gasket. Have done a few of these on 4-cyl '06 and newer
Sonatas. This would explain the roughness as well. In fact, it's
usually obvious if you remove the plastic engine cover and look
around.
 
hyundaitech said:
Okay, skip the sender idea. I'm guessing you have a leaking intake
manifold gasket. Have done a few of these on 4-cyl '06 and newer
Sonatas. This would explain the roughness as well. In fact, it's
usually obvious if you remove the plastic engine cover and look
around.
Click to expand...

Yep, that appears to be it. Any idea why this is a common failure mode?
I've never before had a vehicle where the intake manifold gasket
failed and I've run several cars well over 100,000 miles.

Is the replacement gasket better than the original? Do I need to plan
to replace this every 50,000 miles on this engine?

Matt
 
Yep, that appears to be it.  Any idea why this is a common failure mode?
  I've never before had a vehicle where the intake manifold gasket
failed and I've run several cars well over 100,000 miles.

Is the replacement gasket better than the original?  Do I need to plan
to replace this every 50,000 miles on this engine?

Matt
Click to expand...

My only suspicion is improper torque from the factory, either too
loose allowing the gasket to get sucked in, or too tight, damaging and
weakening the gasket so it can get sucked in. Usually, a portion of
the gasket indeed gets sucked in. I don't see enough failures to
expect that all cars will have it, just enough to know that with
certain symptoms, this is an excellent first place to look. In my
opinion, the gasket is stout enough-- a couple layers of thick paper
like most intake gaskets. Have seen no difference in construction
between replacement gaskets and the originals.
 
hyundaitech said:
My only suspicion is improper torque from the factory, either too
loose allowing the gasket to get sucked in, or too tight, damaging and
weakening the gasket so it can get sucked in. Usually, a portion of
the gasket indeed gets sucked in. I don't see enough failures to
expect that all cars will have it, just enough to know that with
certain symptoms, this is an excellent first place to look. In my
opinion, the gasket is stout enough-- a couple layers of thick paper
like most intake gaskets. Have seen no difference in construction
between replacement gaskets and the originals.
Click to expand...

Have you had a hard time getting the gaskets? It has been two weeks
(last Thursday) since the dealer ordered mine and it has yet to arrive.

Matt
 
Voyager said:
Have you had a hard time getting the gaskets? It has been two weeks
(last Thursday) since the dealer ordered mine and it has yet to arrive.

Matt
Click to expand...

They finally got the gasket today. Have it installed Wednesday and hope
that really is the problem!

Matt
 

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