NOx Sensor 2 Circuit Performance
What does POWERSTROKE-P229F mean?
The POWERSTROKE-P229F (Power Stroke) diesel fault code means: NOx Sensor 2 Circuit Performance. This is a serious severity code.
Common Symptoms
- CEL
- Derate
- Emissions system warning
Probable Causes (Ranked by Likelihood)
- Failed downstream NOx sensor Very Likely
- SCR catalyst failure Likely
- Harness fault Possible
Step-by-Step Diagnostic Procedure
Compare upstream vs downstream NOx readings at hot idle.
Replace downstream NOx sensor if values are nonsensical.
Frequently Asked Questions
What is P229F on a 6.7L Power Stroke (Scorpion)?
P229F on a 6.7L Power Stroke (Scorpion) (2011-present) indicates: NOx Sensor 2 Circuit Performance. This is a known diagnostic trouble code on this engine family and typically points to the causes listed above.
Can I drive with P229F on my Power Stroke?
Only drive short distances to get to a repair facility. Continued operation may cause further damage.
How much does it cost to fix P229F?
Repair cost is typically $400-$1,200 depending on the underlying cause and whether you DIY or use a shop. Diagnostic time alone runs $100-$180 at most independent diesel shops.
P229F on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: