Question about 1999 Pontiac Sunfire
Won't pass emissions test.1999 sunfire 2.2
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Posted on Jan 02, 2017
CODE PO172 - FUEL SYSTEM RICH BANK 1 CONDITIONS. POSSIBLE CAUSES : 1. BASE ENGINE MECHANICAL FAULT AFFECTING ONE OR MORE CYLINDERS. 2.EVAP SYSTEM COMPONENT HAS FAILED OR CANISTER FUEL SATURATED. 3.FUEL CONTROL SENSOR IS OUT OF CALIBRATION.( ECT IAT MAP ) 4. FUEL SYSTEM SUPPLYING TOO MUCH FUEL AT IDLE SPEED OR AT CRUISE. 5. FUEL INJECTOR(S) IS LEAKING OR STUCK PARTIALLY OPEN. ( ONE OR MORE ) 6. HO2S IS CONTAMINATED DETERIORATED OR IT HAS FAILED.
Posted on Nov 10, 2009
you need to get rid of passlock or spend a lot of money in the new cylinder and key that only a dealer would make. There is a detailed write-up for bypassing passlock here: http://newrockies.ca . The guy is great, and this was the only way I was able to save my Park Avenue.
Posted on May 01, 2010
SOURCE: My service (with a wrench)
ABS and Trac light are both on because of a anti-lock brake system issue. This will not effect the emissions system of your vehicle. You probably have a bad wheel speed sensor but there is no way to tell without plugging in to your diagnostic plug with a scan tool.
Posted on May 06, 2011
Check vacuum lines at the throttle body for leaks if good then take EGR Valve off and clean carbon out with a non-chlornated brake cleaner.Then clear code from computer and if it comes back on check the fuel pressure it should be 48-55 psi with the key on and the engine off.If its not within these specs then the fuel pump is weak and needs to be replaced.
Posted on Nov 02, 2011
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