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So I'm having this issue that is driving me crazy. My SAI (Secondary AIr Injection) and Oxygen Sensor are not reaching "Ready Status"
A little background about my car.
2006 Boxster S 3.2L
FVD Exhaust system
GMS Headers with 200 cell cats - has all 4 O2 sensors attached.
996 throttle body and distribution hose
ECU Tuning Group tune
I had the car up in BC Canada since 2009 (although it is a US car) and had no problems passing the sniffer and obdII tests - both before and after all the mods except for the ECU tune.
I went to get my emissions testing done last week in Texas and failed due to the 2 systems being in not-ready status. I figured it might have to do with the cat delete ( ROW) configured in the tune. I sent my ECU back to ETG in California and had them re-flash my ECU in order to re-enable the O2 sensors.
I cleared all codes and figured I would start fresh. I drove the car about 120 miles and attempted to follow the drive cycle mentioned in the forums but it was really tough with the roads out here. Everything is in ready status except for the SAI, and the O2 sensor. I can manually start the SAI using the Durametric system so I would believe the pump is not bad; however, I'm not
sure that I"m hearing the SAI start up when I cold start the engine.
For testing purposes I unplugged my O2 sensors from both bank1 and bank2 and they both threw fault codes which confirms that the ECU tune re-activated my sensors.
I've uploaded a few pictures with the results from a OBDII app as well as the Durametric Software to my Google Drive. I'm not quite sure how to interpret the Durametric Voltage results - especially the negative 50 V and -127V - seems quite odd.
Any help or guidance will be appreciated as I'm out of ideas.
Here’s a quick tutorial on how to fix a P0492 error code on a Boxster 986 / 987 / Carrera 996 / 997.
Error: P0492 – Porsche fault code 208 – Secondary-air system bank 2
Symptoms: no visible symptoms, except for the CEL (check-engine light) being triggered, particularly during cold engine startups with the SAI (Secondary Air Injection) pump running for the first 90 seconds.
Diagnostics: when troubleshooting the P0492 error code, I initially focused my attention on all SAI components located on top of the engine, such as the SAI pump, hoses, solenoids, vacuum hoses and reservoir, etc.
I found it easier to remove all vacuum components and work on a workbench and running individual tests, with the invaluable help of a handheld vacuum tool. I did find the vacuum reservoir had a leak, and one vacuum line was damaged (mostly brittle due to heat / time). Also tested both solenoids with a 12-V DC power supply and then replaced the damaged components with new ones. The CEL was off for a few days, but it came back on, throwing the same error code.
With great help of Ahsai on troubleshooting the O2 sensors readings during a cold startup cycle (thread here), it looked like the problem was an obstruction in one of the paths used by the SAI pump to blow cold air form the engine compartments into the catalytic converters. And because I didn’t wanted to work on my car during the cold season, I parked the project for the winter and lived with the CEL on for many months, certainly one of my joys in life ;)
Solution: When the first nice spring days finally arrived, I used the opportunity to do this and other maintenance jobs in my car, like deep cleaning after the winter season (It’s my all-year-round daily driver), two axle rebuild job, etc.
With regards to the exhaust manifolds removal procedure, where a broken bolt can quickly become a nightmare, I had already done some prep-work on all manifold bolts: driving the car until reaching running temperature, quickly jacking-up the car and loosen all exhaust bolts while still hot, thoroughly cleaned, anti-seize and remount. This method, while not everyone’s cup of tea, ended up being quite effective in my case.
And when I finally removed both exhaust manifolds, where I was originally expecting lots of carbon buildups, I instead found a soft clay-like product (oil?), which was quite easy to remove with a finger nail (through the gloves, of course ;).
I thoroughly pressure-washed all components, carefully avoiding to send the water jet directly into the exhaust valves / catalytic converters and the use of any degreasers. A 2,000 psi electric pressure-washer with a 10 degree spread nozzle can be extremely effective, particularly at short distances. Attached is a picture of the engine block after the pressure-washing job.
Finally, a grey Scotch-brite, well lubricated in oil, for mirror-like surface finishes (well, in most cases). It honestly looked amazing… too bad I forgot to take a picture… my apologies.
Finishing-up with another thorough cleanup of all exhaust bolts, a new thin layer of anti-seize and a complete car reassembly, and my P0492 error code is finally gone, hopefully for good!
I've been lurking the forum and have been struggling with some CEL codes with my 2000 Boxster S.
A little history that I have been battling with P1126 and P1133 ever since changing out the two pre-cat O2 sensors.
Then I went ahead and replaced it with a MAF and the car has been code-free for two weeks.
Now the problem is that the SAI monitor is still showing incomplete and I've done numerous cold starts.
I've read many posts in regards to this issue and saw what the "passing" graph looks like from here http://www.renntech.org/forums/topic/49155-secondary-air-test-readiness-monitor-incomplete/?p=272478
Couldn't figure why the SAI monitor never became ready status, I finally got a BT OBD2 reader. This morning, I took some reading of the voltage from the O2 sensors on a cold start.
Could someone here look at a graph and shed some light to my problem?
Should the magenta (B2S2) voltage matches the green (B1S1) sensor? Anything else looks wrong in the graph?