13 Hyundai Post Catalyst Lean

Jeremiah Diagnostician Campbell, California Posted   Latest  
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2013 Hyundai Elantra GLS 1.8L (E) 6-spd (A6GF1)—KMHDH4AE8DU516323
P2096 - Post Catalyst Fuel Trim System Too Lean Bank 1
P2196 - O2 Sensor Signal Biased/Stuck Rich Bank 1 Sensor 1
MIL On

Came in a year ago with the P2096 Post Catalyst fuel trim lean, replaced the post cat O2 and re flashed the ECM per the TSB. Came back a short time ago with a P2096 and P2196, Down stream lean, up stream rich. Got a new post cat O2 and up stream AF. Both aftermarket Denso sensors. ECM calibration checked and found current. Both codes have returned within a few days of clearing several times. No vacuum or exhaust leaks found. Fuel trim looks normal at idle, 2500 and wile driving. Total with in 10% Engine performance feels good. Strong Manifold vacuum. 20+. Good fuel pressure. Map sensor scoped good. No drop outs. Map sensor also replaced. Purge valve not leaking. I can watch the down stream O2 sensor read lean on the scanner. Happens once per key cycle at steady cruse. Event lasts for a few seconds then reading returns to around 700mv. Some times sets the codes when this happens sometimes not. Any suggestions are appreciated.

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Edward Owner/Technician
San Antonio, Texas
Edward
   

Hello, Jeremiah Not sure if this will help but I run across a issue with aftermarket sensors being mist box or they pull the wrong part looks like this unit has OEM# Front,w/calif Ecs 39210-2e400 Front,w/o calif Ecs 39210-2e500 Rear,w/ calif Ecs 39210-2e100 Rear,w/o calif Ecs 39210-2e200 Denso Sensors Upstream w/calif. 234-5082 Upstream w/o calif. 234-5083 Downstream w/o calif…

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Albin Diagnostician
Leavenworth, Washington
Albin
 

Any time you see the front sensors showing a rich condition, (more fuel than air) and the rear sensors reporting a lean condition( more air than fuel ), someone is lying, or you have an air leak in the exhaust. Get yourself a set of new OE sensors. that way you should get the correct sensors for the application. Once the sensors are baselined, You have something to work with.

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Thomas Technician
Manassas Park, Virginia
Thomas
 

Jeremaih as stated above, something is lying. For example If you have a lambda of 1 entering the engine, youll have a lambda of 1 exiting the engine and entering the cat. The Cat does not change air fuel ratio. So you should have a lambda of 1 exiting the cat. Unless you have a exhaust leak between up stream and down stream you can not have Rich on one 02 and Lean on the other 02.

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Geoff Diagnostician
Lahaina, Hawaii
Geoff
 

In regards to; "I can watch the down stream O2 sensor read lean on the scanner. Happens once per key cycle at steady cruse. Event lasts for a few seconds then reading returns to around 700mv. Some times sets the codes when this happens sometimes not. Any suggestions are appreciated. " I think that is normal ECM strategy, it is testing. Test results must be borderline and when it fails, it trips

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Darren Mechanic
West Allis, Wisconsin
Darren
 

Whats the 5 gas telling you?

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Geoff Diagnostician
Lahaina, Hawaii
Geoff
 

I am not the OP Darren

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