Emissions OBD testing problem, check engine light
What is your question?
Check engine light on, solenoid purge valve (from Nissan) replaced, then car driven appr. 45 minutes (65 mph), check engine light off then back ON! How can OBD system indicate some other problem, and could it be a problem with computer (OBC) itself?! (1996 Nissan Maxima must pass smog inspection.)
What makes this problem better or worse?
Unknown - check engine light on, solenoid purge valve replaced, light still ON
How long has your 1996 Nissan Maxima had this problem?
Approximately 3 weeks
1 Reply
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Tuffy Tire & Auto Service Center - Grandview
1524 W 5th Ave
Columbus, OH
Closed
Opens 8:00 AM Mon
Excite Auto Repair & Towing
3430 Westerville Road
Columbus, OH
Closed
Opens 9:00 AM Mon
All In Auto Service
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Closed
Opens 8:00 AM Mon
Since on-board diagnostics can't pinpoint the actual problem, can an emissions test site show problem? Or, should I go to Nissan dealer to see if they have more detailed diagnostics than my mechanic.
It is likely the purge valve was replaced based solely on the diagnostic trouble code. Subsequent *hands-on* testing must follow code retrieval to confirm what the actual failure is.. Many times the sensor gets blamed mistakenly when it’s just doing what it is supposed to do - report a problem within a particular system to the control module - which turns the light on. Of course I can’t determine what has taken place here exactly - can only make a best online guess. Perhaps you could quiz your mechanic further. Good luck!
Thanks for your replies and comments. The fault code was reported as PO443 (emissions). I'm not certain what "hands-on" testing is, or what is involved, and possible cost.
P0443 NISSAN Possible Causes: EVAP control system pressure sensor Damage harness or connectors to the Purge Control Valve The valve circuit is open or shorted EVAP canister purge volume control solenoid valve may be faulty (The valve is stuck open) This is an example of what needs to be tested .. I can’t elaborate on the cost - too many variables.
More thanks. The purge valve was ordered from Nissan as replacement part, and the repair shop is highly rated and listed @ this web site. I would HOPE that the mechanic checked everything related to this after replacement.