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Showing results for tags 'p1128'.
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Hi all, Looking for some guidance here on a 2000 Boxster Tiptronic with about 120k mi. I am intermittently getting P1128 (360) / P1130 (361) codes which will sometimes cause a CEL and also sometimes the CEL will also go away without resetting. Durametric specifies these as idle range codes. I know the typical reasons for these codes which I am chasing down right now. I have a smoke tester being delivered tomorrow to investigate further if there are any vacuum leaks in the intake. For context, I replaced the MAF about 6 months ago as I thought this could be the source. I did the oil cap test and idle changed when I took cap off, so that leads me to believe it is not crankcase vacuum leak. No smoke on startup and the AOS is relatively new (5ys, 10k mi on it). Put in a new fuel pump 4yrs ago (8k mi on it). SAI system does not appear to be an issue based on lack of codes and SAI readiness being good. I tightened the clamps around the intake boots last weekend thinking this could be the problem, but got the CEL again this week. I will check the air filter and throttle body this weekend for debris when I do the smoke test. Getting around to my question...I went to get smog check (California) when I had no CEL for quite some time, and all readiness monitors were good except for Catalyst. Before the CEL came on this week, I checked readiness monitors and again all were good except for catalyst. Are there any possible correlations between these codes and the catalyst not being ready? Does this lead you to suggest any other things that I should check? I have checked the O2 sensor voltages for all sensors. All look good except for possibly Bank 2 behind the cat...it basically follows the O2 sensor ahead of the cat. I ordered a new O2 sensor and will replace that this weekend to see if it helps. I am fearing that maybe that catalytic converter has gone bad due to the signal I am seeing, but I am not getting any specific catalytic converter codes and have not over the past two years of seeing this. Fingers crossed it's just the O2 sensor, but I changed that one about 6yrs ago (only 16k mi on it since then). Maybe irrelevant but I also get the occasional P0197 code for oil temperature sensor below limit. Please let me know your thoughts. Thanks!
