Got P1128/P1130 at idle.

[blue62]

Originally Posted by timqqt

By the way, the code happens every 200-300 miles. I am not sure why this happens so evenly. The same P1128/P1130 and very similar freeze frame.

Codes like the ones you are getting are due to issues that are not immediately harmful to the catalytic converters. The OBDII system has to see same code logging event back to back over two driving cycles. The first time the system sees the event that would trigger your P1128 or P1130 code it logs the event and puts it in its memory as a pending code. if the same event happens on the next drive event or cycle it moves the code from pending code to a hard code and triggers your check engine light.

This is why you can erase some codes and they take some time to reappear.

If you were having an issue that was immediately harmful to the catalytic converter the OBDII system would trigger your check engine light on the first event.
A misfire is an example of such an issue.

[timqqt]

Originally Posted by blue62

Codes like the ones you are getting are due to issues that are not immediately harmful to the catalytic converters. The OBDII system has to see same code logging event back to back over two driving cycles. The first time the system sees the event that would trigger your P1128 or P1130 code it logs the event and puts it in its memory as a pending code. if the same event happens on the next drive event or cycle it moves the code from pending code to a hard code and triggers your check engine light.

This is why you can erase some codes and they take some time to reappear.

If you were having an issue that was immediately harmful to the catalytic converter the OBDII system would trigger your check engine light on the first event.
A misfire is an example of such an issue.

Thanks. It looks like the problem is much more easy now. The leak is not very obvious but actually intriguing the fault codes. Do you know how much it takes for a independent shop to fix it?

[blue62]

Originally Posted by timqqt

Thanks. It looks like the problem is much more easy now. The leak is not very obvious but actually intriguing the fault codes. Do you know how much it takes for a independent shop to fix it?

Sorry I have no idea as to costs at an independent shop or at a dealer.
I never take my cars to someone else.

If you take it to a shop most are parts changers these days.
Try to find one that has a person with true diagnostic abilities.
More and more rare these days and hard to find.

[Jager]

AOS is suspect.

At idle remove your oil fill cap... Is it difficult to remove? After removal does the opening sound like a Shop Vac? Put your hand over the opening... Is there a lot of suction?

[timqqt]

Originally Posted by Jager

AOS is suspect.

At idle remove your oil fill cap... Is it difficult to remove? After removal does the opening sound like a Shop Vac? Put your hand over the opening... Is there a lot of suction?

Yes. A lot of suction. And I can hear that if I open the oil cap. The engine runs lean.

I can hear the leak is around the AOS. I may do a smoke test. Thanks!

[Jager]

Originally Posted by timqqt

Yes. A lot of suction. And I can hear that if I open the oil cap. The engine runs lean.

I can hear the leak is around the AOS. I may do a smoke test. Thanks!

Check the connections on the AOS but most likely you will need to replace the AOS . I have replaced five of them over the years on my vehicles. When you live at lower elevations, near the coast, the AOS failure rate is high. There are very few AOS failures in Colorado.

[timqqt]

Originally Posted by Jager

Check the connections on the AOS but most likely you will need to replace the AOS . I have replaced five of them over the years on my vehicles. When you live at lower elevations, near the coast, the AOS failure rate is high. There are very few AOS failures in Colorado.

What does it mean if there is a suction when I open the oil cap?

[Gilles]

Originally Posted by timqqt

Yes. A lot of suction. And I can hear that if I open the oil cap. The engine runs lean.

I can hear the leak is around the AOS. I may do a smoke test. Thanks!

Tim, perhaps you may want to check (/replace..?) as well the accordion tube that connects the AOS with the engine block as this plastic gets brittle with age.
.

[Jager]

Originally Posted by Gilles

Tim, perhaps you may want to check (/replace..?) as well the accordion tube that connects the AOS with the engine block as this plastic gets brittle with age.
.

A new AOS will come with one.