Jan 07, 2015 · An intermittent voltage signal from EVAP control system pressure sensor is sent to Engine Control Module (ECM). The Evaporative Emission System (EVAP) control system pressure sensor detects pressure in the purge line. The sensor output voltage to the Engine Control Module (ECM)...
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Jan 24, 2011 · The check engine light in my car is cycling on and off (on for a week, off for a week). Two questions: 1. If I take the car in for an emissions/smog test when the check engine light is off, will it pass. 2.
Jan 29, 2020 · If the vehicle's gas cap is loose or missing, the car's computer can register this as a problem with the emissions system. Gasoline from the tank may evaporate out, lowering the mileage on the car. This problem is usually very easy to fix. If the cap is loose, the check engine light should go off a day or two after it's tightened.
It then re-lit a minute or two later. I tightened the gas cap (friend suggested) and drove to my friends house, no light appeared. Spent the rest of the weekend hanging out and doing a fair share of driving. No light. Drove back down here to long beach (nice warm day) and right as I turn off for my exit ramp, I get the check engine light.

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Aug 05, 2008 · Check Engine light is coming on intermittently and more frequently. It happened for the first time about 1 month ago. We hit a patch of uneven pavement on the interstate and the Vehicle Stabilization light came on at the same time as the CEL. The VSA lights went off after we turned the car off an back on, but the CEL light did not.
Run the engine to temperature with the radiator cap off to allow any trapped air to vent, then put the cap on and check for leaks. Also a good idea to test a new t-stat prior to installation. Drop it in a pot of water on the stove and use a thermometer to see at what temperature it opens and that it opens fully.
Nov 05, 2013 · Check Engine Lights – What Will Turn Them Off. One of the most asked questions that I get each day is “my check engine light came on today, what can I do to turn it off”. It’s a great question, and one that needs a little explanation….so here it goes. First, lets talk about the color of the light that has come on.

Check engine light on and off intermittently

Aug 20, 2015 · The first one (it may be bad), is the AT Check warning light, typically is on but when I drive, randomly goes off (and on again). When the warning is off, the gear indicator shows D while when the warning is on, it shows 4. BMW Z4 E89 Roadster oil warning light - the oil warning light can illuminate in different ways, the way in which is illuminates will depend on the actual fault as shown below. The warning lamp lights up in red: The engine oil pressure is too low. Stop the vehicle immediately and switch off the engine. Check the engine oil level and top up if ... Oct 08, 2005 · I have a 2000 ES 300.Back in Aug the check engine + trac off light started illuminating intermittently. By the time I took it to the local toyota dealer and had them run diagnostics the lights were on all the time. They pulled codes P0171 and P0330. The tech said he found the mass air flow senor ... Possible connection between low fuel and check-engine light. Question: It seems the light comes on right before I fill up, and then it goes off again – why is that? Answer: We have addressed the topic of the check-engine light in the past, but not with such a narrow focus on this particular activity that might cause the light to illuminate.

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