WileECoyote wrote:Replaced the secondary O2 sensor, three rain sessions later and still no check engine lights have returned.
WileECoyote wrote:Seems as though Pontiac/Toyota have an issue with the other codes for the ECU and disabling the TCS system whenever anything triggers a code!
You could definitely add some dielectric grease to the connector and see if that stops the problem. i'd also check the wire right at the o2 sensor to see if it's cracked or anything.Glenpointe wrote:I have exactly the same problem with my 2009 with 2.4L engine 5sp automatic. I got caught in a heavy rain few days ago, and my check engine light turned on and my VSC off light flasing. However, the lights turned off the next day. It rained again last night and the same lights turned on today. It stored 2 codes. P0138 and P0607. I am baffled why does the O2 sensor trigger this code after rain? The only thing that I can think of is the O2 connector got wet and shorted out. And after you drive a car for while, it dries out and everything is OK. I bet the O2 is still good, but the connector seal is deteriorated overtime. Wondering if I can seal the connector or I need to replace the O2 sensor?
why not hooking up a scan tool with live data and pull the live feeds of the o2 sensors? If the o2 sensor is reading normally using live data, that surely isn't the problem.PonchoGT wrote: ↑Wed Oct 16, 2019 10:21 amMy '09 Vibe GT's been doing the same thing. Code P0607 after rain/moisture conditions.
According to General Motors Co., the problem typically surfaces in high ambient temperatures with the air conditioning system on and is most likely due to water entering the pre-cat O2 sensor's electrical connector. A clogged evaporator drain is the true villain. Drying the connector and clearing the drain often eliminates the trouble.
I tried that. However, it didn't fix my problem. Since my sensor is out of its recommended service life, I'll replace the pre-cat 02 sensor and see if that does the tick.
To a point, yes, they age. However, so long as they're reading within their limits, they're fine. My '03 GT was on the original o2 sensors when I sold it at 280k miles.PonchoGT wrote: ↑Wed Oct 16, 2019 10:37 amI hooked my OBD II Scan Tool up and it did record erratic live readings in the form of voltage fluctuations from the 02 sensor bank. That, and the fact my downstream sensor is outside it's maximum service life (I know, I should have replaced them both at the same time) lead me to conclude my sensor is indeed faulty.
My mechanic told me these sensors can also be damaged by environmental factors such as water, splashes from road salt, oil and dirt. He also said as they age and becomes sluggish, the time it takes them to react to changes in the air/fuel mixture slows down which can also throw a trouble code.