Code 32 egr on a 1990
Thread Starter
Racer
Joined: Jul 2013
Posts: 260
Likes: 49
From: Florence ALABAMA
Code 32 egr on a 1990
I have read several threads regarding this, and the various fixes people have done, however, my 90 set this code this moring after 10-15 miles of highway driving, just like it does for many others, so I scanned and found it. BUT, a previous owner has REMOVED the EGR and replaced with a block off plate and I dont see any vacuum lines loose anywhere on the motor. Is it possible the the O2 sensor (original, I assume) could be causing this code due to faulty data from the EGR being bypassed? Kinda confused.
Thread Starter
Racer
Joined: Jul 2013
Posts: 260
Likes: 49
From: Florence ALABAMA
Melting Slicks
Joined: Nov 2016
Posts: 2,236
Likes: 3,063
From: So Cal
2023 C4 of the Year Finalist - Unmodified
I believe that in the L98 the MAT sensor is only used to enable EGR. MAT must be >59F for EGR. Install a 7,500 ohm resistor across the MAT sensor wires. (Sensor disconnected permanently.) The ECM will think the MAT is <40F and never turn on the EGR. No Code 32. You can't just unplug the sensor or Jumper the two MAT wires or you'll set MAT codes 23 and/or 25. You need a resistor.
Last edited by IHBD; May 4, 2026 at 10:17 PM.
