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I have a 2000 Porsche Boxster S that I recently took to a Smog Test Only place here in California to complete a smog check in order to regsister my car for the next year.

My car failed the test as a gross polluter. I need to fix the problem.


The "Check Engine" light was not on when I went for the test. Car was/is running fine. Recentlty started to smell odor coming from car when outside the car after driving. Don't smell anything in the car when driving.

Have noticed small occasional oil drops under car under engine.

The only other change in my car is after a repair to my right front fender due to someone hitting me - it is almost impossible to fill up the tank to the "full" level on the guage. The gas pump/handle itself when filling the car clicks off like every 10 seconds - so it takes forever to fill up the tank. I need to find out what is causing this - perhaps something not put back together properly by the body shop???

The test says that I passed these areas:


Catalytic Converter

Fuel Injection

Vaccuum Line Connection

Fuel Cap Functional


Pump Air Injection

Ignition Spark Controls

02 Sensors and Connectors

Other Emissions Related

Fuel Evaporative Controls

Fuel Tank Cap Visual

Wiring of Other Sensors or Switches

Liquid Fuel Leaks

The test says that these results are as listed as N/A

Visual EGR

Fuel Evap Test

Thermostatic Air Cleaner

Functional EGR

Fill Pipe Restrictor


Ignition Timing TDC

The ASM Emission Test Results are:

@ 15mph

RPM - 1842

MEAS CO2% - 12.27

MEAS 02% - 0.00


HC (PPM) GP 274


CO% MAX - 0.51

CO% GP - 2.01

CO% MEAS - 4.28

NO (PPM) MAX - 443

NO (PPM) GP - 1930

NO (PPM) MEAS - 15

Result - Gross Polluter

@ 25mph

RPM - 1916

MEAS CO2% - 12.25

MEAS 02% - 0.00

HC (PPM) MAX - 40

HC (PPM) GP - 224

HC (PPM) MEAS - 153

CO% MAX - 0.49

CO% GP - 1.99

CO% MEAS - 4.31

NO (PPM) MAX - 730

NO (PPM) GP - 1730

NO (PPM) MEAS - 15

Result - Gross Polluter

Now my check engine light comes on from time to time and then goes away. The OBD Code that comes up - even with no "Check Engine" light on - is P1128.

I've seen alot of posts for when P1128 comes up along with P1130 - but none yet with only P1128 coming up.

I've read that it's a good idea to check/clean MAP - which I will do this afternoon - but I'm wondering - with all the info/details above - does anyone know or have an opinion if the problem can be zero'ed in to one thing only or possible - or will many things need to be checked tested?

The problem is - and maybe some of you have been in the same situation - I don't have the funds that I had when I bought the car and when I did I'd take it into a qualified shop. But times are tough and don't currently have those kind of funds. I can/will repair whatever is necessary - but I'm trying to avoid buying/trying many parts/labor that is not necessary.

With all the data above - would appreciate any advice/suggestions/opinions!



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You didn't say how many miles on the car. Somewhere between 40K and 65K miles? The first thing to try is to clean the MAF, since you can get either a P1128 or P1130 without the other (I did). If that's the mileage range, you should probably also clean the throttle body while you're at it.

Cleaning the MAF should only be considered a temporary fix, and has been said here many times, you have no idea what you're getting when you buy one on eBay or similar

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Hi Geoff - I have 98K on the car.

If you're still on the original MAF with 98K miles, it seems like you did really well compared to many of the postings here. Did you clean your MAF with contact cleaner, and if yes, did that seem to keep the CEL off?

As far as problems filling with fuel, the easiest place to start is to check fuse E6 - if that's blown, you need to replace the fuse. In 2003, Porsche started taping up the electric connector for the phone in the center console (under your radio and A/C). Look at this topic for more details

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