P2033Generic code

P2033 Code: Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 2)

The P2033 code means the signal from the exhaust gas temperature (EGT) sensor, bank 1 sensor 2, is above its maximum value. The main effect is that the computer may cut engine power or suspend particulate filter regenerations. You can drive with caution, but have it checked soon.

Severity
Medium
Can I keep driving?
Yes, but with caution
Estimated cost
$60 to $250
Difficulty
Medium
System
Emissions Control
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P2033 code means

EGT sensors measure the exhaust temperature ahead of the turbo, the catalytic converter or the particulate filter. The computer uses them to protect the turbo and the catalytic converter and to control the regeneration of the particulate filter.

The sensor changes its resistance with temperature, and the computer measures the resulting voltage. The P2033 code is a high signal, which is usually caused by an open circuit or an interrupted ground.

Most of these are thermistors or thermocouples that work up to about 900 °C (1,652 °F). On these codes, sensor 1 is usually the one closest to the engine. See the EGT sensor guide for how to test one.

To confirm the diagnosis, measure the continuity of each wire between the component connector and the computer connector with the key off. It should be under 1 ohm, and an infinite reading means the wire is open. If the wiring checks out, measure the component itself: infinite resistance confirms that it is open inside.

P2033 code symptoms

  • Check engine light on.
  • The computer may reduce engine power or suspend particulate filter regenerations.

Likely causes of the P2033 code

  1. Loose or broken connector. The most frequent cause.
  2. Signal or ground wire cut. The signal rises all the way to the reference.
  3. Sensor open inside, with infinite resistance.
  4. Short to 5 volts or 12 volts from rubbing against another wire in the harness.

How to diagnose the P2033 code step by step

  1. Read the sensor value on the scan tool and compare it with what you expect.
  2. Inspect the connector for corrosion, water or loose pins.
  3. Check power and ground with the key on: the reference should be correct and the voltage drop on the ground should be under 0.1 volt.
  4. Measure the signal with the connector plugged in and see whether it changes with the condition.
  5. Do a wiggle test on the harness with the scan tool in graph mode.
  6. Check the continuity of each wire to the computer. It should be under 1 ohm.

How to fix the P2033 code

  • Repair the connector or the wiring.
  • Replace the sensor if the tests confirm it is bad.
  • Correct the real condition if there is one.
  • Clear the codes and verify the repair with a road test.

Technical reference data

  • Resistance at room temperature: about 200 ohms on many PTC sensors. It varies by type.
  • Working range: -40 to 900 °C (-40 to 1,652 °F).
  • These values are only a guide, so look up the manufacturer data for your vehicle.

Brand-specific notes

Short city trips are the main enemy of the particulate filter, whatever the brand. The source lists these codes as frequent on the diesel vehicles below.

P2033 on Volkswagen, Audi and SEAT

This code is frequent on diesel Volkswagen, Audi and SEAT models.

P2033 on Peugeot, Citroen and Renault

This code is frequent on diesel Peugeot, Citroen and Renault models.

P2033 on Ford

This code is frequent on diesel Ford models.

P2033 on Mercedes-Benz and BMW

This code is frequent on diesel Mercedes-Benz and BMW models.

P2033 on Toyota Hilux, Nissan Navara and Chevrolet

This code is also frequent on the Toyota Hilux, the Nissan Navara and diesel Chevrolet models.

Frequently asked questions about P2033

Can I drive with a P2033 code?
With caution. It can limit engine power or keep the particulate filter from regenerating.
Does the sensor have to be replaced?
Only if the tests confirm it. The connector and the wiring fail just as often as the sensor.
What does the B1S2 EGT sensor do?
EGT sensors measure the exhaust temperature ahead of the turbo, the catalytic converter or the particulate filter. The computer uses them to protect the turbo and the catalytic converter and to control the regeneration of the filter.
How much does it cost to fix P2033?
Roughly $60 to $250, depending on whether it is a connector, a wire or the sensor.
What does the P2033 code mean?
It is a generic OBD2 code that means the signal from the exhaust gas temperature sensor on bank 1, sensor 2, is above its maximum value. An open circuit or an interrupted ground is the usual reason.
Will a P2033 code clear itself?
Only if the cause was a passing glitch. A loose connector or a cut wire will bring the P2033 code back.
What is the most common cause of P2033?
A loose or broken connector. After that, look for a cut signal or ground wire, and for a sensor that is open inside.

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