Technical Description
System Too Rich (Bank 1)
What does that mean?
This diagnostic trouble code (DTC) is a generic powertrain code, which indicates that it applies to OBD-II equipped vehicles. While it is a generic code, the specific repair steps may vary depending on the make and model of the vehicle.
In simple terms, this means that an oxygen sensor in bank 1 has detected a rich condition, indicating that there is too little oxygen in the exhaust. In engines with V6, V8, or V10 configurations, Bank 1 refers to the side of the engine that contains cylinder #1.
Note: This DTC is very similar to P0175, and it is possible for your vehicle to display both codes simultaneously.
Symptoms
You will most likely not notice any drivability issues, although there may be symptoms such as a misfire.
Causes
A code P0172 may indicate that one or more of the following events have occurred:
Possible Solutions
Possible solutions include:
Related DTC Discussions
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P0171 is displayed on the scanner, but there is no service light on. After approximately 30 miles, P0172 becomes active and triggers the service engine light. The vehicle seems to be running fine, but no one can figure out the rich bank 1 code (P0172). The trim codes have been recalibrated and the engine computer has been updated three times…
Hello all. I purchased a 04 Envoy 4.2L about two years ago and I love it. However, it needs some help. This may be a long story, but I want to make sure I don’t miss any important details. I was towing a camper over the weekend (weighing 2600lbs, which the envoy is fully capable of towing)…
Here is the history: 2006 GMC Yukon 5.3L Code Z for flex fuel. The vehicle has approximately 107000 miles on the clock. I initially had an evap issue with code P0449. I ended up having to replace the purge valve solenoid. During this time, I also developed P0172 and P0449 codes. The P0449 code is now gone, and I am currently trying to cor…
My first code on the 99 Dodge Caravan V6 was P0138. I replaced the rear O2 sensor and now I have a P0172 code… The engine always emits a terrible smell (rich fumes), which I understand is the issue. Can anyone shed some light on this? Jeff??…
I’ve replaced the EGR valve, all 4 O2 sensors, plugs, wires, cap&rotorX3. Now that I’ve got your curiosity – Here’s our story – I’ve had this wonderful 213k mile 96 AWD GMC Safari (Chevy Astro) since 70k miles. Its only failings were 3 fuel pumps, 1 alternator, 1 radiator, and one water valve thing…
I’m having trouble with my truck. The scanner says PO172 bank 1. The truck won’t start unless I press on the gas, but while it’s running, it shakes. When I finally let go of the gas, it slowly turns off. Can anybody help? Thanks in advance…
I have a 99 Dodge Caravan Sport van with a 3.3L engine and approximately 80K miles. I can’t seem to get rid of the O2 codes. The engine is definitely running rich and emits a bad smell. It idles very rich (rough) for about 2 minutes when it is restarted while hot, and then suddenly revs up by itself and runs smoothly at idle. Occasional…
I have a 97 Dakota with a 318 engine and it is displaying a bank 1 rich condition. I have already changed the O2 sensors, and with an Actron scanner, I can view live data from all sensors. The short term fuel trim runs between 0-5 +/-, while the long term fuel trim has a variance of -29 or greater. Once it is warmed up, it only drops to -26. Based on what I have read…
I have a 99 Chrysler Sebring LXI automatic. I am experiencing trouble with the engine. After approximately 2 1/2 hours of driving, it starts to sputter very badly. It has trouble changing gears. Prior to the 2 1/2 hours of driving, it runs perfectly fine. I had it scanned and the following codes appeared: PO017…
Why would this be? The MIL comes on and goes off automatically when it is supposed to, but when I use the scan tool, it shows a code even when the MIL does not light up at all. What is going on?…
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