codes p0171 and p0174 in bank 1 and bank 2 cleaned MAF sensor could it be leak in intake manifold

Asked by May 12, 2016 at 06:37 AM about the 2004 Cadillac DeVille Base

Question type: Maintenance & Repair

2 Answers

10,645

Yes, it can be an intake leak check all hoses and the intake manifold. It can also be the 02 sensors HEGO (heated exhaust gas oxygen). Have it read for codes, even if the check engine light is NOT on the computer will have stored information and codes. Discount auto stores will read codes for no fee. write them down.

1 out of 1 people think this is helpful.
37,965

P0171 CADILLAC - Fuel Trim System Lean Bank 1... Possible causes - Intake air leaks - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Lack of fuel - Faulty Mass Air Flow (MAF) sensor - Incorrect Positive Crankcase Ventilation (PCV) hose connection... If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced. The P0171 code could also be caused may be caused by one or more of the following: debris on MAF sensor causing an incorrect reading, improper oil level, low or high fuel pressure or Engine Control Temperature (ECT) Sensor reading inaccurate............ P0174 CADILLAC - Fuel Trim System Lean Bank 2.... Possible causes - Intake air leaks - Faulty front heated oxygen sensor - Ignition misfiring - Faulty fuel injectors - Exhaust gas leaks - Incorrect fuel pressure - Lack of fuel - Faulty Mass Air Flow (MAF) sensor - Incorrect Positive Crankcase Ventilation (PCV) hose connection... If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced... The P0174 code could also be caused may be caused by one or more of the following: debris on MAF sensor causing an incorrect reading, improper oil level, low or high fuel pressure or Engine Control Temperature (ECT) Sensor reading inaccurate. There is a factory service bulletin for the following Cadillac models: 2000-2008 Cadillac Factory Service Bulletin OBDII Code P0174

3 out of 3 people think this is helpful.

Your Answer

Add photo

Related Questions

Search Cadillac DeVille Questions

Cadillac DeVille Experts

#1 kikero
kikero
Reputation 1,890
#2 Js08016
Js08016
Reputation 1,410
#3 Cynthiasmith
Cynthiasmith
Reputation 1,330
View All

Related Models For Sale

Used Cadillac CTS
433 Great Deals out of 13,036 listings starting at $1,295
Used Lincoln Town Car
41 Great Deals out of 2,138 listings starting at $1,999
Used Chevrolet Impala
928 Great Deals out of 36,398 listings starting at $1,800
Used Cadillac STS
45 Great Deals out of 1,198 listings starting at $2,995
Used Cadillac Escalade
356 Great Deals out of 11,010 listings starting at $2,995
Used Chrysler 300
490 Great Deals out of 20,895 listings starting at $1,500
Used Mercedes-Benz S-Class
175 Great Deals out of 5,975 listings starting at $2,500
Used BMW 7 Series
179 Great Deals out of 5,843 listings starting at $1,600
Used Chevrolet Tahoe
1,070 Great Deals out of 31,943 listings starting at $1,495
Used Honda Accord
1,181 Great Deals out of 77,750 listings starting at $969