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Old 04-04-2009, 11:41 AM   #1
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Join Date: Mar 2008
Location: United Kingdom
Posts: 1
Sudden loss of power and the CEL comes on

My pride and joy (1997 Boxster 2.5) played up on me on my way to work yesterday morning. I was driving on the motorway when there was a sudden loss of power. I was able to nurse it to the nearest off-ramp. I was able to crawl at a snails pace with the engine RPM just above idle. Any attempt to accelerate ended up with the engine cutting out. On the way to a nearby garage close to the off-ramp, the CEL started flashing for a short wile and eventually ended up as a full amber. At this point normal engine power was restored and I steadily returned home.

I downloaded the fault codes last night and now need some advice on what the problem may could be. For what I was able to establish searching the forum points towards a faulty MAF. Even though several O2 fault codes appear in the list, am I correct to assume that they only reports the emission issues and that the actual item causing the problem is “upstream”. This leads me to believe that it may be the MAF to blame.

P.S. A problem I’ve also been struggling from time to time is when accelerating the engine briefly “hesitates” going through the 4500 RPM range. This I also considered to be the MAF giving notice.

The fault codes downloaded are listed below.

Eagerly awaiting your responds.


Motronic 5.2.2
Current Fault Codes
Factory Fault Code 27 - Oxygen sensing adaptation range 1 (cylinders 1-3)
Lean limit
Factory Fault Code 35 - Oxygen sensing adaptation range 1 (cylinders 4-6)
Lean limit
Factory Fault Code 174 - Camshaft adjustment, bank 1
Factory Fault Code 26 - Oxygen sensing adaptation range 2 (cylinders 1-3)
Enrichment limit
Factory Fault Code 34 - Oxygen sensing adaptation range 2 (cylinders 4-6)
Enrichment limit
Factory Fault Code 62 - Misfire, emission related
Factory Fault Code 50 - Misfire, cylinder 1, emission related
Factory Fault Code 55 - Misfire, cylinder 6, emission related
Factory Fault Code 51 - Misfire, cylinder 2, emission related
Factory Fault Code 10 - Oxygen sensor ahead of catalytic converter (cylinders 1-3)
Short circuit of wires or limited voltage increase
Factory Fault Code 18 - Oxygen sensor ahead of catalytic converter (cylinders 4-6)
Short circuit of wires or limited voltage increase
Factory Fault Code 75 - Misfire damaging to catalytic converter
Factory Fault Code 63 - Misfire, cylinder 1, damaging to catalytic converter
Factory Fault Code 64 - Misfire, cylinder 2, damaging to catalytic converter
Factory Fault Code 65 - Misfire, cylinder 3, damaging to catalytic converter
Factory Fault Code 52 - Misfire, cylinder 3, emission related

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Old 04-05-2009, 06:05 PM   #2
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Location: Wisconsin
Posts: 2,095
Was it raining hard or did you drive through some deep water?
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster bought new. Installed used motor at 89k.
1987 924S. 2002 996TT. PST2
Owned and repaired Porsches since 1974. Have driven them all the way the Dr intended...
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Old 04-06-2009, 06:56 AM   #3
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Location: Cleveland GA USA
Posts: 2,424
I'd say the MAF is responsible, since all of them are similar, except the cam tining code.. That can be a vario cam actuation issue.

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