P2198: O2 Sensor Signal Biased/Stuck Rich Bank 2 Sensor 1
A generic powertrain (engine and transmission) trouble code, same meaning on every brand.
Yes - expect poor economy and possible hesitation.
Symptoms
- Hesitation under light throttle
- Worse fuel economy
- Rough idle in some cases
Likely causes, most common first
- Bank 2 upstream sensor biased rich
- Deposits on the sensing element
- Short in the sensor wiring
- Genuinely rich mixture on that bank
Read P2198 yourself before paying for diagnosis
A basic Bluetooth OBD-II scanner ($20-40) plugs into the port under the dashboard and shows this code with live sensor data on your phone - useful both for confirming the fix and for talking to a shop from an informed position.
What is going on and how it gets diagnosed
P2198 reports a rich bias on the bank 2 upstream sensor. Sensors on both banks are the same age and have seen the same fuel, so a bias fault on one is a reasonable prompt to look closely at the other before it sets its own code.
If both banks show bias in the same direction, stop suspecting the sensors. Two sensors rarely drift the same way at the same time; a fuel pressure problem or a contaminated batch of fuel affects both equally and is the more likely explanation.
Repair options and cost
Typical US independent-shop ranges, parts and labor. Dealers run higher; regional labor rates vary.
Owner reports mentioning P2198
“The engine light is on in my car. I took it to a repair shop and they said it had the codes of p2196 and p2198 a h02s heated oxygen sensor is malfuntioning. When the rep pulled up the codes he informed me they had thousands of my same vehicle with the same problem. I contacted ford warranty and they said it was not covered. This is horrible for ford to know this is a defect on their vehicle and not be responsible for fixing it. So I would like to launch this formal complaint. I will never buy another ford vehicle again. The aip has gone out in my vehicle and I have had other issues that the ford warranty has said did not apply. The vehicle was in motion when the light came on.”2013 Ford Edge · Jan 2020 · 90,000 mi
Cars that report P2198 most often
Based on mentions of this code in NHTSA owner complaints.
Frequently asked questions
Can I drive with P2198?
Yes - expect poor economy and possible hesitation.
How much does it cost to fix P2198?
Typical US repair costs range from $80 for the simplest fix (upstream oxygen sensor) to $600 in the worst case. The right number depends on which cause your car has - see the causes list.
Related codes
The codes closest to P2198. They often appear together, and telling them apart is usually what narrows the diagnosis.
Definition per SAE J2012 standard nomenclature. Symptoms, causes and costs are editorial guidance - always confirm with a diagnosis of your specific vehicle.