Workshop · diagnostics and repairsWe reply the same day
Diagno.ee

All BMW fault codes

EGR valve

P1453 Secondary air pump relay circuit fault

By: · Updated:

P1453 means: Secondary air pump relay circuit fault. The secondary air system blows air into the exhaust on a cold start so the catalytic converter warms up faster. OK to drive, but have it checked soon. The repair usually costs about €80–600 in Estonia. The most common cause: air pump seized by moisture or burnt out.

Is it safe to drive?OK to driveOK to drive, but have it checked soon.
Typical repair cost€80–600parts and labour in Estonia

What it means

The secondary air system blows air into the exhaust on a cold start so the catalytic converter warms up faster. The computer found too little air or a fault in the pump or valve control.

This is a make-specific code (BMW). The exact meaning can vary by model and year.

What you may notice

  • Engine light on
  • Unusual pump noise on a cold start
  • Usually no change in driving

What could be wrong

  1. 1Air pump seized by moisture or burnt out
  2. 2Check valve stuck
  3. 3Hose loose or cracked
  4. 4Pump relay or fuse

Repair difficulty: Moderate

What you can check yourself

On a cold start, listen for the pump droning in the engine bay for a few seconds. You can check the simple things yourself, but the repair is best done in a workshop.

How we fix it

  1. We check pump and valve operation with the diagnostic tool
  2. We check the hoses and relay
  3. We replace the pump or valve

Standard SAE description: Secondary Air Pump Relay Control Circuit

This code usually comes with: Check engine lightSee what the light means →

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

Book a diagnostic check

Questions

What does fault code P1453 mean?

Secondary air pump relay circuit fault. The secondary air system blows air into the exhaust on a cold start so the catalytic converter warms up faster. The computer found too little air or a fault in the pump or valve control.

Can I drive with code P1453?

OK to drive, but have it checked soon.

How much does it cost to fix P1453?

Roughly €80–600 in Estonia. The price depends on exactly what has failed and on the car.

How is P1453 fixed?

We check pump and valve operation with the diagnostic tool. We check the hoses and relay. We replace the pump or valve.

Related codes

P1456Fuel vapour leak on the tank sideP1450Unable to pull vacuum in the fuel tankP2426EGR cooler: signal or voltage too lowP2427EGR cooler: signal or voltage too highP2430Secondary air system: circuit fault (bank 1)P0424Catalyst temperature sensor: too low (heated catalyst, bank 1)P0093Large leak in the fuel systemP1416Secondary air valve fault (bank 2)

Based on AI combined with our hands-on workshop experience and knowledge. This information is general and prices are approximate (Estonian workshop rates). The same code can mean different things on different cars. Only an inspection of the car gives a definite answer.

Book a diagnostic check