My 2005 V70 2.5T with 130k miles started tossing Check Engine lights. Usually the code was p0442, a few times p0440 on my generic code reader. I checked the purge valve up front, fine, and changed the gas cap since the elastic strap was broken anyway. Still in trouble. I bought an Autophix code reader that displays Volvo-specific codes to help narrow it down, but guess what it does NOT read the emissions codes. ES6110 I would warn against buying - even the generic portion works more poorly than the $30 unit I bought 10 years ago. I was not impressed at all, as especially the omission of EVAP system.
I took it to my Indy Volvo mechanic, who works for a shop that charges less than the stealer but is still not cheap. He smoke tested it and found no leak. He said the purge pump seemed to be working, so he didn't want to replace it. He then said that he found an additional Volvo code that neither triggered a OBDII on my generic reader or any code that the Autophix had found - I didn't write the Volvo code down but it was MAF sensor signal too low (I think). I asked 'could the EVAP leak code be triggered by the MAF sensor being bad?" He thought for a few seconds, and said "yes, I think so..."
I went right to my local parts yard, and they had several used ones. I bought one, and thus far after the readiness codes have all become ready, the problem has not resurfaced. I never had a drivability problem, other than occasional brief stumbling on start. But I still have that.
I thought I would post this, since nowhere else did I find a report where a bad MAF sensor triggered an EVAP leak code.
Don
p0440 and p0442 EVAP leak turns out to be MAF sensor
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timetobakethedonuts
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- Year and Model: '14 XC70 T6 '98 S70
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br0dy519
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- Year and Model: 2004 XC70
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Count your blessings that it wasn’t the dreaded J hose. Congrats on the repair. It seems I need to connect VIDA semi annually and trigger the purge valve manually a few times in order to clear mine. Third time replacing it. I’m over it.
04s60 2.4
04xc70 2.5t
04xc70 2.5t
prwood wrote:I wish I had a permanent car repair area that was covered, had a level surface, lighting and fans, a workbench, and tool cabinets. You know,like a garage. Much of my time during the job is spent hauling things up and down the stairs to the basement or in and out of the storage shed, or running back downstairs when I realize I need something else,or taking a break from standing out in the sun,or using flashlights or work lamps when it gets dark.
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timetobakethedonuts
- Posts: 35
- Joined: 8 November 2019
- Year and Model: '14 XC70 T6 '98 S70
- Location: Pennsylvania
- Has thanked: 8 times
- Been thanked: 14 times
The tech had the hoses ready - convinced he would find them degraded. They were not. At the cost of the hoses, I do kind of wish he had put them in while he had the exhaust lowered. He may have thought he would be going back in. I am keeping my fingers crossed. At the moment no codes, readiness indicators are good. Inspection due in 10 days.
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