P0170
P0172
ERROR CODES
P0172
ERROR CODES
Dec 17, 2014 at 4:37 AM
HOW MANY OXYGEN SENSOR DOES MY CAR HAVE AND LOCATIONS
2002 ACURA TL
KENAZUU
- MEMBER
- 1 POST
Advertisement
JACOBANDNICKOLAS
- ✓ASE Certified Mechanic
- 110,194 POSTS
There should be only 2. There is a heated O2 sensor both before the catalytic converter and after. They are both mounted in the exhaust system.
The P0172 indicates the fuel mixture is too rich (too much gas). Check fuel pump pressure to assure the regulator is working.
The P0170 indicates a fuel trim malfunction. Fuel trim is the time the computer allows the injector to be open to inject fuel. If it is open too long, you will get a rich mixture.
The most common mistake people make is to replace the oxygen sensors when this problem comes up. Most commonly, there is a vacuum leak at the manifold which leans the fuel mixture and then the PCM over compensated providing too much fuel to the engine. Thus, the codes you are seeing. Also, a bad or faulty Mass Air Flow sensor can do the same.
Check these things before just replacing the oxygen sensors.
Joe
The P0172 indicates the fuel mixture is too rich (too much gas). Check fuel pump pressure to assure the regulator is working.
The P0170 indicates a fuel trim malfunction. Fuel trim is the time the computer allows the injector to be open to inject fuel. If it is open too long, you will get a rich mixture.
The most common mistake people make is to replace the oxygen sensors when this problem comes up. Most commonly, there is a vacuum leak at the manifold which leans the fuel mixture and then the PCM over compensated providing too much fuel to the engine. Thus, the codes you are seeing. Also, a bad or faulty Mass Air Flow sensor can do the same.
Check these things before just replacing the oxygen sensors.
Joe
Dec 17, 2014 at 5:42 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.