need help on passing emission - Land Rovers Only

joed · 11-27-2006, 06:14 PM

I have two error codes P0171 system to lean bank 1
P0174 system to lean bank 2,could anybody help me to fix this problem because i ned to pass emission test,

s928s · 11-27-2006, 07:12 PM

check for a posible intake gasket leak and or loose hose. Also Mass air sensor can trigger a false error for a lean code. feeds both cylinder banks.

Disco Mike · 11-27-2006, 07:41 PM

Look for vaccum leaks for sure. MAf to be failing will also need to show a code for 3rd. or 4th. gear tranny shifting problems.
Has you gas mileage or performance fallen off lately?
Mike

joed · 11-28-2006, 07:23 AM

Disco Mike,my mileage and performance are still the same,i'll check for vaccum leakage and get back to you.

Disco Mike · 11-28-2006, 07:40 AM

Usually when the MAF fails both MPG and performance fall off and your exhaust can get a sulfur smell.
Mike

11-27-2006, 06:14 PM	#1 (permalink)
joed Member Join Date: Oct 2005 Posts: 5 Gallery: 0	need help on passing emission I have two error codes P0171 system to lean bank 1 P0174 system to lean bank 2,could anybody help me to fix this problem because i ned to pass emission test,

11-27-2006, 07:12 PM	#2 (permalink)
s928s Member Join Date: Sep 2006 Location: North Wales Pa. Posts: 19 Gallery: 0	check for a posible intake gasket leak and or loose hose. Also Mass air sensor can trigger a false error for a lean code. feeds both cylinder banks. __________________ 1999 DISCO II GREEN/TAN SE7 2000 JEEP GRAND CHEROKEE LTD SILVER/GREY 2000 JEEP CHEROKEE SPORT BLACK/GREY 1982 928 PORSCHE EURO, GREY/BURG. JUBALEE EDITION 1987 944 PORSCHE FLAMINGO/BURG

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11-27-2006, 07:41 PM	#3 (permalink)
Disco Mike Moderator Join Date: Aug 2004 Location: Parker, Colorado Posts: 5,784 Gallery: 0	Look for vaccum leaks for sure. MAf to be failing will also need to show a code for 3rd. or 4th. gear tranny shifting problems. Has you gas mileage or performance fallen off lately? Mike

11-28-2006, 07:23 AM	#4 (permalink)
joed Member Join Date: Oct 2005 Posts: 5 Gallery: 0	Disco Mike,my mileage and performance are still the same,i'll check for vaccum leakage and get back to you.

11-28-2006, 07:40 AM	#5 (permalink)
Disco Mike Moderator Join Date: Aug 2004 Location: Parker, Colorado Posts: 5,784 Gallery: 0	Usually when the MAF fails both MPG and performance fall off and your exhaust can get a sulfur smell. Mike

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