Check Engine L

[Bxsta]

Hi

have some trouble with my 99 Boxster.

Went to the local dealer - diagnosed secd. air ventilation?

P1128 and P1130 are lean condition - after a wile P0150 pops up.

Well, I checked all O2 sensors and one was dead (see pic) driver side after Kat.

Put a new one in but the probelm is still present.

Any idea??

[Loren]

In most cases the O2 sensor is not the problem - it is the device reporting the problem.

P1128 and P1130 say that the fuel mixture is so lean that the DME can not increase the richness enough to compensate. This is usually caused by an intake (or exhaust) system leak, a blocked fuel filter, or low fuel pump pressure. Since (both sets of 3) cylinder banks report the same issue it is unlikely a fouled injector.

[Bxsta]

Thanks!

Before the O2 sensor went out, I went on a trip (sorry had to - 250 miles) and when I started the engine in the morning it smelled like gas - a lot. After that I had to wait like 5 min before I even could drive ( backfire ....).

Again thanks - I will check all those things.

BTW how often do I need to replace the fuel filter?

[Tool Pants]

What happened to that sensor.

The fuel filter is replaced at 60k miles.

[Bxsta]

Hi Tool Pants

I'm not sure what happened - it almost looks like it got hit by something and left some sort of deposit and a hole. I have more pictures (macros) if you like to see then let me know.

Today was strange - in the morning I got a bunch of (9) DTC's :

p0304 - p0306

p1114 - p1119

p0150

misfire ...

reset it and now I'm back to (in order):

p1128

p1130

and a new one p1126

I' getting to the point to ask my dealer to fix it :angry:

Next thing is to change the filter and check on the fuel pressure.

Thanks a lot.

[Loren]

P304 - Misfire, Cylinder 3, Damaging to Catalytic Converter

P306 - Misfire, Cylinder 6, Damaging to Catalytic Converter

P150 - Oxygen Sensor Ahead of Catalytic Converter (Cylinders 4 - 6) - Intercore Short Circuit or Limited Voltage Increase

P1126 - Oxygen Sensing Adaptation Area 1 (Cylinders 4 - 6) - Rich Threshold

(IMHO) I think you need to quit driving this car until you find the problem. Chances are you could have burnt another O2 sensor.

Have you looked for intake leaks like the oil filler hose (cracked?). TSB 9/00 1715 specificaly states:

The oil filler hose (arrow, figure 1) can crack causing the following conditions:

* Check Engine warning light lights up.

* Engine oil leak on the crankcase in the area of the oil filler hose.

* Rough running (rough idling, increased idle speed).

As a result of the incoming secondary air, the following fault codes may be stored in the DME fault memory:

* DME 5.2, P1123 to P1130

* DME 7.2, P1126, P1128, P1130, P1133

[Bxsta]

Hi Loren

I will check on that!

The oil filler hose (arrow, figure 1) can crack causing the following conditions:

* Check Engine warning light lights up.

Don't have any oil leaks

* Engine oil leak on the crankcase in the area of the oil filler hose.

I have only rough idle when I reset DME and cold, when warm, she runs like there is nothing wrong

* Rough running (rough idling, increased idle speed).

As a result of the incoming secondary air, the following fault codes may be stored in the DME fault memory:

* DME 5.2, P1123 to P1130

* DME 7.2, P1126, P1128, P1130, P1133

[Bxsta]

One more pic from that O2 sensor (close ups)

[Bxsta]

Hi Loren

I just checked the oil filler ( see pic ) - there is a oil leakage and oil is dripping on some vacuum lines and something I don't know.

Can you identify the part for me - is that the root cause of my probelms?

The oil filler is not chracked like in the TSB - it is "just a bad connection".

Thanks

[Loren]

I sent you an email with the TSB and a parts list...

[Alienz]

how can you ready the codes?

[Bxsta]

Hi Alienz

I have two DTC reader.

Here is the one I like the most - only $99 but you need a laptop ( my current passenger ).

http://www.digimoto.com/

It comes quite handy at times but you still need the manufactures interpretation of some specific DTC's.

[Bxsta]

Just one more picture - found that the clamps where lose, actually not tight at all.

Hope that's it.

:lightbulb: