P2192 Code: System Too Rich at Higher Load (Bank 1)

What the P2192 code means

The P2192 code is a more precise version of P0172. Besides telling you the mixture is rich, it tells you when it happens. Bank 1 is the side of the engine that has cylinder number 1. On an inline engine there is only bank 1.

A rich mixture that shows up with more load points to high fuel pressure or to a sensor that is feeding the computer a wrong number for its air and fuel calculation.

The key tool is the fuel trim data in three conditions: idle, 2,500 rpm with no load, and driving under load. Reading the pattern across those three conditions tells you whether you are chasing a fuel delivery problem or an air measurement problem. A guide on fuel trims and one on finding vacuum leaks are both useful companions for this code.

Because the computer stores a freeze frame when the code sets, always look at it first. It shows the engine speed, load and temperature at the moment the fault was recorded, and that confirms the condition you need to reproduce during testing.

P2192 code symptoms

• Check engine light on.
• Fuel smell.
• Black smoke from the tailpipe in severe cases.
• Higher fuel use than normal.

Likely causes of the P2192 code

1. High fuel pressure. Confirm it with the tests in the diagnosis section.
2. Leaking injectors. Confirm them with the tests in the diagnosis section.
3. Coolant temperature sensor that reports a colder engine than the real one.
4. Valve timing out of phase on engines with variable valve timing.

How to diagnose the P2192 code step by step

1. Read the fuel trims in all three conditions and compare the two banks.
2. Check the freeze frame to confirm the condition in which the code set.
3. Test the purge valve by disconnecting it and seeing whether the trim corrects itself.
4. Measure fuel pressure at idle and under load.
5. Clean or test the MAF sensor and compare its reading with the engine displacement.
6. Test the front oxygen sensor, both its response and its heater.

How to fix the P2192 code

• Replace the faulty injector or fuel pressure regulator.
• Correct the fuel pressure.
• Clean or replace the MAF sensor if it reads wrong.
• Clear the learned fuel trims and the codes, then verify in all three conditions.

After the repair, take a road test with some load on the engine and watch the trims again. If the P2192 code does not return and the trims stay near zero, the job is done.

Technical reference data

• Normal total trim: between -10% and +10%.
• Beyond +25% or below -25%, most computers store the code.
• Approximate MAF reading at idle: 2 to 7 g/s depending on engine size.
• These are reference values only: check the manufacturer data for your vehicle.

Brand-specific notes

This code is common on high-mileage engines. The crankcase ventilation hoses and the plastic intake manifold gaskets are known weak points, so check them early in the diagnosis.

P2192 on Ford

Seen often on Ford engines with a lot of miles on them. Start with the crankcase ventilation hoses and the intake manifold gaskets.

P2192 on Mazda

Also frequent on high-mileage Mazda engines, with the same weak points to check: the ventilation hoses and the plastic manifold gaskets.

P2192 on Chevrolet

Common on Chevrolet engines with many miles. Inspect the crankcase ventilation hoses and the manifold gaskets first.

P2192 on Nissan

Nissan engines with high mileage show this code often too, and the ventilation hoses and plastic manifold gaskets are the usual suspects.

Frequently asked questions about P2192