BOBCAT-P20EE serious Bobcat ›

SCR NOx Catalyst Efficiency Below Threshold (Bank 1)

The BOBCAT-P20EE (Bobcat) diesel fault code means: SCR NOx Catalyst Efficiency Below Threshold (Bank 1). This is a serious severity code.

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Keep driving?
Limited driving only
DIY difficulty
advanced
Estimated cost
$300-$3,500

What Are the Symptoms of BOBCAT-P20EE?

  • Derate warning / 3-stage inducement countdown
  • CEL and DEF lamp

What Causes BOBCAT-P20EE? (Most Likely First)

  • Contaminated DEF fluid (wrong fluid / water) Likely
  • Failed downstream NOx sensor Likely
  • Plugged / aged SCR catalyst Possible

Can I Still Drive with BOBCAT-P20EE?

Limited driving only. BOBCAT-P20EE is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.

Frequently Asked Questions

What is Bobcat code P20EE?

Bobcat P20EE: SCR NOx Catalyst Efficiency Below Threshold (Bank 1). This code is reported on Bobcat equipment running the described engine family.

Can I keep working with Bobcat code P20EE?

Limited operation only -- finish the current task then shut down for repair.

How much does Bobcat P20EE cost to fix?

Estimated repair cost: $300-$3,500. Off-road diesel shop labor runs $125-$175/hr in 2026. Dealer diagnostic software (Bobcat Service Analyzer) is usually required.

Mechanics Guide Step-by-step diagnosis

How Do You Diagnose BOBCAT-P20EE?

  1. Test DEF fluid with refractometer (32.5% urea).

  2. Scan NOx sensor outputs upstream/downstream during load.

  3. Check SCR inlet NH3 dosing via Service Analyzer.

Sources 1

This page is built from documented references. Verify against your own service info before repair work.

  • SAE J2012Diagnostic Trouble Code Definitions (defines P20EE as a generic OBD-II code)

P20EE on Other Platforms

The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:

Duramax critical SCR NOx Catalyst Efficiency Below Threshold Bank 1 Hino serious SCR NOx Catalyst Efficiency Below Threshold Bank 1 Isuzu serious SCR NOx Catalyst Efficiency Below Threshold Bank 1 Kubota serious SCR NOx Catalyst Efficiency Below Threshold - Bank 1 Power Stroke serious SCR NOx Catalyst Efficiency Below Threshold Bank 1 Yanmar serious SCR NOx Catalyst Efficiency Below Threshold

Which Vehicles Commonly Get BOBCAT-P20EE?

  • Bobcat S650 skid steer loader (Kubota V3800)
  • Bobcat S740 / S750 / S770 / S850 skid steer loaders (Kubota V3800)
  • Bobcat T650 / T750 / T770 / T870 compact track loaders (Kubota V3800)
  • Bobcat E50 / E55 / E60 / E85 mini excavators (Kubota V3800)
  • Bobcat UW56 utility vehicle (Kubota V3800)

Explore More

More Bobcat codes → Diesel home All diesel codes Heavy-duty Guides

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