Skip the auto shop - Our mechanics make house calls

Q: P0171 code

asked by on

I have rebuilt the top end completely and have added short pipe headers still have cat and i keep getting the 02 bank 1sensor 1 to lean p0171 and I've replaced iac map tps and checked lined and intake for leaks and nothing runs fine idles fine doesn't get hot but still runs this code please help

My car has 199682 miles.
My car has an automatic transmission.

A: Hi there: In general, the P0171 OBD-II err...

Hi there:

In general, the P0171 OBD-II error code indicates that on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine. This could be caused by multiple problems ranging from a vacuum leak, mass air flow sensor, a bad fuel injector or other components that have bad electrical connections. It's also possible that the change to the "short pipe" has altered the performance of the engine. Typically any change in exhaust system hardware is accompanied by a tuning upgrade to the ignition or fuel / air mixture to compensate. If you haven't completed that step, you might want to contact the aftermarket manufacturer of the "short pipe headers" to see what they recommend for your 1999 Ram 1500.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: How can I get my truck to start??

Hi there. The check engine coming light on leads me to believe the ECM (engine control module)/computer has recognized the fault. Accessing the ECM for codes may help identify what component may have failed. The no start could be the...

Q: Car won't go in drive or reverse what do i do

The first thing to check is to see if the shift cable is not broken or has a bad grommet end connector. Go to the shift linkage at the transmission first to see if cable is connected. If it is...

Q: Something draining the battery

If it ran for 30 minutes after a jump, the alternator is probably ok. I would start by checking the battery first. Alternators are not designed to charge a dead battery. A good battery, that is completely dead, takes more...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...