trouble code 45

gaas12 · 02-28-2009, 07:10 AM

any one have any ideas what may cause trouble code 45 0n a 1988 chevy 1500, with a 350 engine. i just put this engine in about a week ago. i read where it mean rich exhaust but didn't say what might cause it. thanks

bradrhale · 02-28-2009, 07:15 AM

Left bank O2 sensor error (rich condition indicated)
could be caused by an O2 sensor.

Case 7230 · 02-28-2009, 09:51 AM

Running rich can be caused by sticking injectors or defective fuel pressure regulator. Or as Brad says may just be bad oxygen sensor. If it has more than 60000mls on it I would replace it anyway, clear the code and see if it comes back.

crabtruck · 02-28-2009, 04:25 PM

Could also be from a low vac/leak condition (or a bad MAP thinking so, if there).
ECT could fool ECM also. Suggest check for plugs being on tight and vac leak
before anything expensive. Check fuse for the o2 if heated kind.

leolkfrm · 02-28-2009, 06:06 PM

if you have someone with a scanner it may shed more light on the problem

02-28-2009, 07:10 AM	#1
gaas12 Junior Member Join Date: Feb 2009 Posts: 7	trouble code 45 any one have any ideas what may cause trouble code 45 0n a 1988 chevy 1500, with a 350 engine. i just put this engine in about a week ago. i read where it mean rich exhaust but didn't say what might cause it. thanks

02-28-2009, 06:06 PM	#5
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,931	if you have someone with a scanner it may shed more light on the problem __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

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02-28-2009, 07:15 AM	#2
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 9,542	Left bank O2 sensor error (rich condition indicated) could be caused by an O2 sensor.

02-28-2009, 09:51 AM	#3
Case 7230 Senior Member Join Date: Dec 2007 Posts: 666	Running rich can be caused by sticking injectors or defective fuel pressure regulator. Or as Brad says may just be bad oxygen sensor. If it has more than 60000mls on it I would replace it anyway, clear the code and see if it comes back.

02-28-2009, 04:25 PM	#4
crabtruck Senior Member Join Date: Jul 2007 Posts: 4,128	Could also be from a low vac/leak condition (or a bad MAP thinking so, if there). ECT could fool ECM also. Suggest check for plugs being on tight and vac leak before anything expensive. Check fuse for the o2 if heated kind.